diff --git a/docs/source/tendering/http/tutorial/active-cancellation.http b/docs/source/tendering/http/tutorial/active-cancellation.http
index efa8f1247d..73d0f2666a 100644
--- a/docs/source/tendering/http/tutorial/active-cancellation.http
+++ b/docs/source/tendering/http/tutorial/active-cancellation.http
@@ -1,7 +1,7 @@
-PATCH /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/cancellations/d4d0fafa7fbf40b8b171adc3651ed356?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 30
-Content-Type: application/json
+PATCH /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/cancellations/d4d0fafa7fbf40b8b171adc3651ed356?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 30
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -19,24 +19,24 @@ Content-Type: application/json; charset=UTF-8
       {
         "hash": "md5:00000000000000000000000000000000", 
         "description": "Changed description", 
-        "title": "Notice.pdf", 
-        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/888a378eb7764d1693a1fec763cb806f?KeyID=a8968c46&Signature=66iYlHWRzl%252BEJRqmPqx781kVoy2WJlTVVKmZsNxrbNcxI0ib35aJ507wHARZ0lNebq9cfxuwi161lXFPn2NEAw%253D%253D", 
         "format": "application/pdf", 
+        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/888a378eb7764d1693a1fec763cb806f?KeyID=a8968c46&Signature=66iYlHWRzl%252BEJRqmPqx781kVoy2WJlTVVKmZsNxrbNcxI0ib35aJ507wHARZ0lNebq9cfxuwi161lXFPn2NEAw%253D%253D", 
+        "title": "Notice.pdf", 
         "documentOf": "tender", 
-        "datePublished": "2020-05-15T01:00:03+03:00", 
-        "id": "2c95fa8b548444c08d8575bfc95f0bea", 
-        "dateModified": "2020-05-15T01:00:03+03:00"
+        "datePublished": "2020-05-01T01:00:03+03:00", 
+        "dateModified": "2020-05-01T01:00:03+03:00", 
+        "id": "2c95fa8b548444c08d8575bfc95f0bea"
       }, 
       {
         "hash": "md5:00000000000000000000000000000000", 
         "description": "Changed description", 
-        "title": "Notice-2.pdf", 
-        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/c9f250e2f74e4e8e95a882add5b4401a?KeyID=a8968c46&Signature=zr1a4Vd8WIGqoGAskp1DDf5%252BQzA6WJ5nV1uzXJIgIc3nK%2FJFCw%252BGK4aIT7vCv8qv8WTHWJ4%252BN%2Fb5gGIWIzYKAQ%253D%253D", 
         "format": "application/pdf", 
+        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/c9f250e2f74e4e8e95a882add5b4401a?KeyID=a8968c46&Signature=zr1a4Vd8WIGqoGAskp1DDf5%252BQzA6WJ5nV1uzXJIgIc3nK%2FJFCw%252BGK4aIT7vCv8qv8WTHWJ4%252BN%2Fb5gGIWIzYKAQ%253D%253D", 
+        "title": "Notice-2.pdf", 
         "documentOf": "tender", 
-        "datePublished": "2020-05-15T01:00:03+03:00", 
-        "id": "2c95fa8b548444c08d8575bfc95f0bea", 
-        "dateModified": "2020-05-15T01:00:03+03:00"
+        "datePublished": "2020-05-01T01:00:03+03:00", 
+        "dateModified": "2020-05-01T01:00:03+03:00", 
+        "id": "2c95fa8b548444c08d8575bfc95f0bea"
       }
     ], 
     "reason": "cancellation reason", 
diff --git a/docs/source/tendering/http/tutorial/auction-url.http b/docs/source/tendering/http/tutorial/auction-url.http
index 7318d0bce5..90f70fdcf3 100644
--- a/docs/source/tendering/http/tutorial/auction-url.http
+++ b/docs/source/tendering/http/tutorial/auction-url.http
@@ -1,5 +1,5 @@
-GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680 HTTP/1.0
-Authorization: Bearer broker
+GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680 HTTP/1.0
+Authorization: Bearer broker
 Host: lb-api-sandbox.prozorro.gov.ua
 
 Response: 200 OK
@@ -81,15 +81,15 @@ Content-Type: application/json; charset=UTF-8
       {
         "hash": "md5:00000000000000000000000000000000", 
         "description": "document description modified", 
-        "title": "Notice.pdf", 
+        "author": "tender_owner", 
         "url": "http://public-docs-sandbox.prozorro.gov.ua/get/4d52879c11df4aa7ae80d3b6c4a274ce?KeyID=a8968c46&Signature=BiR23Y26fUFdAaBBqxSqN2Lv29UkW8VjpoZA0NLoVj2cgKeSq3J%2FiuGzva%252Bl0R6wpgLbA2zfat9mNkErf3HjAg%253D%253D", 
         "format": "application/pdf", 
         "documentOf": "tender", 
-        "datePublished": "2020-05-15T01:00:01+03:00", 
-        "author": "tender_owner", 
+        "datePublished": "2020-05-01T01:00:01+03:00", 
         "documentType": "technicalSpecifications", 
         "id": "8a3d30101dc94ca58f768bec6a1f45dd", 
-        "dateModified": "2020-05-15T01:00:01+03:00"
+        "title": "Notice.pdf", 
+        "dateModified": "2020-05-01T01:00:01+03:00"
       }, 
       {
         "hash": "md5:00000000000000000000000000000000", 
@@ -98,9 +98,9 @@ Content-Type: application/json; charset=UTF-8
         "url": "http://public-docs-sandbox.prozorro.gov.ua/get/55286412717f4997b35cde1cdc8ca4a3?KeyID=a8968c46&Signature=SLJwlJyNeYyhfqlj5fjfDUM5HpgwZKwSFTALjLjeIuv5mzql8Jjjua0WO8iNogqE6c0DA0%252BkyD8utzz3zI27BA%253D%253D", 
         "format": "application/pdf", 
         "documentOf": "tender", 
-        "datePublished": "2020-05-15T01:00:01+03:00", 
-        "id": "90a4fef3a0f545f4807445bbd4017f29", 
-        "dateModified": "2020-05-15T01:00:01+03:00"
+        "datePublished": "2020-05-01T01:00:01+03:00", 
+        "dateModified": "2020-05-01T01:00:01+03:00", 
+        "id": "90a4fef3a0f545f4807445bbd4017f29"
       }, 
       {
         "hash": "md5:00000000000000000000000000000000", 
@@ -109,9 +109,9 @@ Content-Type: application/json; charset=UTF-8
         "url": "http://public-docs-sandbox.prozorro.gov.ua/get/5d1c2cddad3f45a3aac16cb29b81f97f?KeyID=a8968c46&Signature=E3RouA49wKUWYJ7BPlrzsmaNUW69ZPMHhlKAAOoUy3gSRyJaA98YqWOvmbQ30Z0oCAQ44WCDW4wlwGZV0RXjCA%253D%253D", 
         "format": "application/pdf", 
         "documentOf": "tender", 
-        "datePublished": "2020-05-15T01:00:01+03:00", 
-        "id": "90a4fef3a0f545f4807445bbd4017f29", 
-        "dateModified": "2020-05-15T01:00:01+03:00"
+        "datePublished": "2020-05-01T01:00:01+03:00", 
+        "dateModified": "2020-05-01T01:00:01+03:00", 
+        "id": "90a4fef3a0f545f4807445bbd4017f29"
       }
     ], 
     "title": "футляри до державних нагород", 
diff --git a/docs/source/tendering/http/tutorial/bidder-documents.http b/docs/source/tendering/http/tutorial/bidder-documents.http
index 0af6b0efe8..8105984cd5 100644
--- a/docs/source/tendering/http/tutorial/bidder-documents.http
+++ b/docs/source/tendering/http/tutorial/bidder-documents.http
@@ -1,5 +1,5 @@
-GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/b31ec66637a141c7bb03446a0f22f5dc/documents?acc_token=7a7e299c46ba4430a2a63af9bf91af30 HTTP/1.0
-Authorization: Bearer broker
+GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/b31ec66637a141c7bb03446a0f22f5dc/documents?acc_token=7a7e299c46ba4430a2a63af9bf91af30 HTTP/1.0
+Authorization: Bearer broker
 Host: lb-api-sandbox.prozorro.gov.ua
 
 Response: 200 OK
@@ -12,9 +12,9 @@ Content-Type: application/json; charset=UTF-8
       "url": "http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/b31ec66637a141c7bb03446a0f22f5dc/documents/86cd9a1b304d4530852984610d67c933?download=748412273ae54b27a3606febdfe1bc93", 
       "format": "application/pdf", 
       "documentOf": "tender", 
-      "datePublished": "2020-05-15T01:00:01+03:00", 
-      "id": "86cd9a1b304d4530852984610d67c933", 
-      "dateModified": "2020-05-15T01:00:01+03:00"
+      "datePublished": "2020-05-01T01:00:01+03:00", 
+      "dateModified": "2020-05-01T01:00:01+03:00", 
+      "id": "86cd9a1b304d4530852984610d67c933"
     }
   ]
 }
diff --git a/docs/source/tendering/http/tutorial/bidder-participation-url.http b/docs/source/tendering/http/tutorial/bidder-participation-url.http
index df5c3d33a2..9462870a58 100644
--- a/docs/source/tendering/http/tutorial/bidder-participation-url.http
+++ b/docs/source/tendering/http/tutorial/bidder-participation-url.http
@@ -1,5 +1,5 @@
-GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/b31ec66637a141c7bb03446a0f22f5dc?acc_token=7a7e299c46ba4430a2a63af9bf91af30 HTTP/1.0
-Authorization: Bearer broker
+GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/b31ec66637a141c7bb03446a0f22f5dc?acc_token=7a7e299c46ba4430a2a63af9bf91af30 HTTP/1.0
+Authorization: Bearer broker
 Host: lb-api-sandbox.prozorro.gov.ua
 
 Response: 200 OK
@@ -14,9 +14,9 @@ Content-Type: application/json; charset=UTF-8
         "url": "http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/b31ec66637a141c7bb03446a0f22f5dc/documents/86cd9a1b304d4530852984610d67c933?download=748412273ae54b27a3606febdfe1bc93", 
         "format": "application/pdf", 
         "documentOf": "tender", 
-        "datePublished": "2020-05-15T01:00:01+03:00", 
-        "id": "86cd9a1b304d4530852984610d67c933", 
-        "dateModified": "2020-05-15T01:00:01+03:00"
+        "datePublished": "2020-05-01T01:00:01+03:00", 
+        "dateModified": "2020-05-01T01:00:01+03:00", 
+        "id": "86cd9a1b304d4530852984610d67c933"
       }
     ], 
     "value": {
diff --git a/docs/source/tendering/http/tutorial/bidder2-participation-url.http b/docs/source/tendering/http/tutorial/bidder2-participation-url.http
index 176649e97f..4e6442e7f4 100644
--- a/docs/source/tendering/http/tutorial/bidder2-participation-url.http
+++ b/docs/source/tendering/http/tutorial/bidder2-participation-url.http
@@ -1,5 +1,5 @@
-GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/694f980947ff4d0b870d9a18384f23fe?acc_token=cfa7d625bdd049c79e3dfa84d8835a53 HTTP/1.0
-Authorization: Bearer broker
+GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/694f980947ff4d0b870d9a18384f23fe?acc_token=cfa7d625bdd049c79e3dfa84d8835a53 HTTP/1.0
+Authorization: Bearer broker
 Host: lb-api-sandbox.prozorro.gov.ua
 
 Response: 200 OK
@@ -14,9 +14,9 @@ Content-Type: application/json; charset=UTF-8
         "url": "http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/694f980947ff4d0b870d9a18384f23fe/documents/ce114f673cf14b039c1ee9705b07c00b?download=9152e77768004ab1ba6b843902ac3f12", 
         "format": "application/pdf", 
         "documentOf": "tender", 
-        "datePublished": "2020-05-15T01:00:01+03:00", 
-        "id": "ce114f673cf14b039c1ee9705b07c00b", 
-        "dateModified": "2020-05-15T01:00:01+03:00"
+        "datePublished": "2020-05-01T01:00:01+03:00", 
+        "dateModified": "2020-05-01T01:00:01+03:00", 
+        "id": "ce114f673cf14b039c1ee9705b07c00b"
       }, 
       {
         "hash": "md5:00000000000000000000000000000000", 
@@ -24,9 +24,9 @@ Content-Type: application/json; charset=UTF-8
         "url": "http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/694f980947ff4d0b870d9a18384f23fe/documents/8baccb56ed4a44a18ef4c13ef8a4094b?download=99993315a2cd472f9387941fe22ee6d5", 
         "format": "application/pdf", 
         "documentOf": "tender", 
-        "datePublished": "2020-05-15T01:00:01+03:00", 
-        "id": "8baccb56ed4a44a18ef4c13ef8a4094b", 
-        "dateModified": "2020-05-15T01:00:01+03:00"
+        "datePublished": "2020-05-01T01:00:01+03:00", 
+        "dateModified": "2020-05-01T01:00:01+03:00", 
+        "id": "8baccb56ed4a44a18ef4c13ef8a4094b"
       }
     ], 
     "value": {
diff --git a/docs/source/tendering/http/tutorial/change-contract-status-to-pending-by-supplier.http b/docs/source/tendering/http/tutorial/change-contract-status-to-pending-by-supplier.http
new file mode 100644
index 0000000000..37516d0d99
--- /dev/null
+++ b/docs/source/tendering/http/tutorial/change-contract-status-to-pending-by-supplier.http
@@ -0,0 +1,129 @@
+PATCH /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3?acc_token=cfa7d625bdd049c79e3dfa84d8835a53 HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 31
+Content-Type: application/json
+Host: lb-api-sandbox.prozorro.gov.ua
+DATA:
+{
+  "data": {
+    "status": "pending"
+  }
+}
+
+Response: 200 OK
+Content-Type: application/json; charset=UTF-8
+{
+  "data": {
+    "status": "pending", 
+    "documents": [
+      {
+        "hash": "md5:00000000000000000000000000000000", 
+        "author": "tender_owner", 
+        "title": "contract_first_document.doc", 
+        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/b97562e3f33c493297fd14dd6d8c50f0?KeyID=a8968c46&Signature=dQMvA4OqNyUhOiqC5GLb4uSEt49HDaSNcEbdsglo9C4Wq8XJDos68B7pBOwMEiRZWStfSwxaG5Hf8DZduhr9DA%253D%253D", 
+        "format": "application/msword", 
+        "documentOf": "tender", 
+        "datePublished": "2020-05-01T01:00:03+03:00", 
+        "dateModified": "2020-05-01T01:00:03+03:00", 
+        "id": "9f3ff556fde24588bb8d43242b4fe977"
+      }, 
+      {
+        "hash": "md5:00000000000000000000000000000000", 
+        "author": "tender_owner", 
+        "title": "contract_second_document.doc", 
+        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/a2aa5b35517c445ca3778b7b25560cc9?KeyID=a8968c46&Signature=VkkdjRhMvrxZzXFjmULpNVxzcq52P09KEEXjD2Fe%252BBMNBH9FUupk0ZN6hHIwAFGr5lYmPcm2HzuX83tijpfOBw%253D%253D", 
+        "format": "application/msword", 
+        "documentOf": "tender", 
+        "datePublished": "2020-05-01T01:00:03+03:00", 
+        "dateModified": "2020-05-01T01:00:03+03:00", 
+        "id": "d0c4000793a24e009a3057b4434ae119"
+      }, 
+      {
+        "dateModified": "2020-05-01T01:00:03+03:00", 
+        "hash": "md5:00000000000000000000000000000000", 
+        "format": "application/pkcs7-signature", 
+        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/4f1b9f5a45364f0cbb725e846b662238?KeyID=a8968c46&Signature=CVe5P9Wl2XZzgeb%2F2VXizVGxoyZ5PZmcSZPdZzb58LZXQ48PfznXpmJcGAzC65u3BgNoBfLxlwaAsU5oNDG%252BBg%253D%253D", 
+        "author": "contract_supplier", 
+        "documentOf": "document", 
+        "relatedItem": "9f3ff556fde24588bb8d43242b4fe977", 
+        "title": "supplier_first_document_sign.pkcs7", 
+        "datePublished": "2020-05-01T01:00:03+03:00", 
+        "id": "6433ef9dfe0443279db2f43f2a226561"
+      }
+    ], 
+    "items": [
+      {
+        "description": "футляри до державних нагород", 
+        "classification": {
+          "scheme": "ДК021", 
+          "description": "Cartons", 
+          "id": "44617100-9"
+        }, 
+        "additionalClassifications": [
+          {
+            "scheme": "ДКПП", 
+            "id": "17.21.1", 
+            "description": "папір і картон гофровані, паперова й картонна тара"
+          }
+        ], 
+        "deliveryAddress": {
+          "postalCode": "79000", 
+          "countryName": "Україна", 
+          "streetAddress": "вул. Банкова 1", 
+          "region": "м. Київ", 
+          "locality": "м. Київ"
+        }, 
+        "deliveryDate": {
+          "startDate": "2020-05-03T01:00:00+03:00", 
+          "endDate": "2020-05-06T01:00:00+03:00"
+        }, 
+        "id": "22efe85457d041aab3bc5a64aae6be0f", 
+        "unit": {
+          "code": "44617100-9", 
+          "name": "item"
+        }, 
+        "quantity": 5.0
+      }
+    ], 
+    "suppliers": [
+      {
+        "contactPoint": {
+          "email": "aagt@gmail.com", 
+          "telephone": "+380 (322) 91-69-30", 
+          "name": "Андрій Олексюк"
+        }, 
+        "scale": "sme", 
+        "name": "ДКП «Книга»", 
+        "identifier": {
+          "scheme": "UA-EDR", 
+          "id": "00137226", 
+          "uri": "http://www.sc.gov.ua/"
+        }, 
+        "address": {
+          "postalCode": "79013", 
+          "countryName": "Україна", 
+          "streetAddress": "вул. Островського, 34", 
+          "region": "Львівська область", 
+          "locality": "м. Львів"
+        }
+      }
+    ], 
+    "contractNumber": "contract #13111", 
+    "period": {
+      "startDate": "2020-05-01T01:00:03+03:00", 
+      "endDate": "2021-05-01T01:00:03+03:00"
+    }, 
+    "dateSigned": "2020-05-01T01:00:03+03:00", 
+    "value": {
+      "currency": "UAH", 
+      "amount": 238.0, 
+      "amountNet": 237.0, 
+      "valueAddedTaxIncluded": true
+    }, 
+    "date": "2020-05-01T01:00:03+03:00", 
+    "awardID": "85136c93a6b043469633be6f0e09aa8b", 
+    "id": "4f7b2b4c16f24c66897d0d18d57c05f3", 
+    "contractID": "UA-2020-05-01-000001-1"
+  }
+}
+
diff --git a/docs/source/tendering/http/tutorial/change-contract-status-to-pending-winner-signing-by-owner.http b/docs/source/tendering/http/tutorial/change-contract-status-to-pending-winner-signing-by-owner.http
new file mode 100644
index 0000000000..e3022b3861
--- /dev/null
+++ b/docs/source/tendering/http/tutorial/change-contract-status-to-pending-winner-signing-by-owner.http
@@ -0,0 +1,117 @@
+PATCH /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 46
+Content-Type: application/json
+Host: lb-api-sandbox.prozorro.gov.ua
+DATA:
+{
+  "data": {
+    "status": "pending.winner-signing"
+  }
+}
+
+Response: 200 OK
+Content-Type: application/json; charset=UTF-8
+{
+  "data": {
+    "status": "pending.winner-signing", 
+    "documents": [
+      {
+        "hash": "md5:00000000000000000000000000000000", 
+        "author": "tender_owner", 
+        "title": "contract_first_document.doc", 
+        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/b97562e3f33c493297fd14dd6d8c50f0?KeyID=a8968c46&Signature=dQMvA4OqNyUhOiqC5GLb4uSEt49HDaSNcEbdsglo9C4Wq8XJDos68B7pBOwMEiRZWStfSwxaG5Hf8DZduhr9DA%253D%253D", 
+        "format": "application/msword", 
+        "documentOf": "tender", 
+        "datePublished": "2020-05-01T01:00:03+03:00", 
+        "dateModified": "2020-05-01T01:00:03+03:00", 
+        "id": "9f3ff556fde24588bb8d43242b4fe977"
+      }, 
+      {
+        "hash": "md5:00000000000000000000000000000000", 
+        "author": "tender_owner", 
+        "title": "contract_second_document.doc", 
+        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/a2aa5b35517c445ca3778b7b25560cc9?KeyID=a8968c46&Signature=VkkdjRhMvrxZzXFjmULpNVxzcq52P09KEEXjD2Fe%252BBMNBH9FUupk0ZN6hHIwAFGr5lYmPcm2HzuX83tijpfOBw%253D%253D", 
+        "format": "application/msword", 
+        "documentOf": "tender", 
+        "datePublished": "2020-05-01T01:00:03+03:00", 
+        "dateModified": "2020-05-01T01:00:03+03:00", 
+        "id": "d0c4000793a24e009a3057b4434ae119"
+      }
+    ], 
+    "items": [
+      {
+        "description": "футляри до державних нагород", 
+        "classification": {
+          "scheme": "ДК021", 
+          "description": "Cartons", 
+          "id": "44617100-9"
+        }, 
+        "additionalClassifications": [
+          {
+            "scheme": "ДКПП", 
+            "id": "17.21.1", 
+            "description": "папір і картон гофровані, паперова й картонна тара"
+          }
+        ], 
+        "deliveryAddress": {
+          "postalCode": "79000", 
+          "countryName": "Україна", 
+          "streetAddress": "вул. Банкова 1", 
+          "region": "м. Київ", 
+          "locality": "м. Київ"
+        }, 
+        "deliveryDate": {
+          "startDate": "2020-05-03T01:00:00+03:00", 
+          "endDate": "2020-05-06T01:00:00+03:00"
+        }, 
+        "id": "22efe85457d041aab3bc5a64aae6be0f", 
+        "unit": {
+          "code": "44617100-9", 
+          "name": "item"
+        }, 
+        "quantity": 5.0
+      }
+    ], 
+    "suppliers": [
+      {
+        "contactPoint": {
+          "email": "aagt@gmail.com", 
+          "telephone": "+380 (322) 91-69-30", 
+          "name": "Андрій Олексюк"
+        }, 
+        "scale": "sme", 
+        "name": "ДКП «Книга»", 
+        "identifier": {
+          "scheme": "UA-EDR", 
+          "id": "00137226", 
+          "uri": "http://www.sc.gov.ua/"
+        }, 
+        "address": {
+          "postalCode": "79013", 
+          "countryName": "Україна", 
+          "streetAddress": "вул. Островського, 34", 
+          "region": "Львівська область", 
+          "locality": "м. Львів"
+        }
+      }
+    ], 
+    "contractNumber": "contract #13111", 
+    "period": {
+      "startDate": "2020-05-01T01:00:03+03:00", 
+      "endDate": "2021-05-01T01:00:03+03:00"
+    }, 
+    "dateSigned": "2020-05-01T01:00:03+03:00", 
+    "value": {
+      "currency": "UAH", 
+      "amount": 238.0, 
+      "amountNet": 237.0, 
+      "valueAddedTaxIncluded": true
+    }, 
+    "date": "2020-05-01T01:00:03+03:00", 
+    "awardID": "85136c93a6b043469633be6f0e09aa8b", 
+    "id": "4f7b2b4c16f24c66897d0d18d57c05f3", 
+    "contractID": "UA-2020-05-01-000001-1"
+  }
+}
+
diff --git a/docs/source/tendering/http/tutorial/get-tender-contracts.http b/docs/source/tendering/http/tutorial/get-tender-contracts.http
new file mode 100644
index 0000000000..94e7fed26f
--- /dev/null
+++ b/docs/source/tendering/http/tutorial/get-tender-contracts.http
@@ -0,0 +1,109 @@
+GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3 HTTP/1.0
+Authorization: Bearer broker
+Host: lb-api-sandbox.prozorro.gov.ua
+
+Response: 200 OK
+Content-Type: application/json; charset=UTF-8
+{
+  "data": {
+    "status": "pending", 
+    "documents": [
+      {
+        "hash": "md5:00000000000000000000000000000000", 
+        "author": "tender_owner", 
+        "title": "contract_first_document.doc", 
+        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/b97562e3f33c493297fd14dd6d8c50f0?KeyID=a8968c46&Signature=dQMvA4OqNyUhOiqC5GLb4uSEt49HDaSNcEbdsglo9C4Wq8XJDos68B7pBOwMEiRZWStfSwxaG5Hf8DZduhr9DA%253D%253D", 
+        "format": "application/msword", 
+        "documentOf": "tender", 
+        "datePublished": "2020-05-01T01:00:03+03:00", 
+        "dateModified": "2020-05-01T01:00:03+03:00", 
+        "id": "9f3ff556fde24588bb8d43242b4fe977"
+      }, 
+      {
+        "hash": "md5:00000000000000000000000000000000", 
+        "author": "tender_owner", 
+        "title": "contract_second_document.doc", 
+        "url": "http://public-docs-sandbox.prozorro.gov.ua/get/a2aa5b35517c445ca3778b7b25560cc9?KeyID=a8968c46&Signature=VkkdjRhMvrxZzXFjmULpNVxzcq52P09KEEXjD2Fe%252BBMNBH9FUupk0ZN6hHIwAFGr5lYmPcm2HzuX83tijpfOBw%253D%253D", 
+        "format": "application/msword", 
+        "documentOf": "tender", 
+        "datePublished": "2020-05-01T01:00:03+03:00", 
+        "dateModified": "2020-05-01T01:00:03+03:00", 
+        "id": "d0c4000793a24e009a3057b4434ae119"
+      }
+    ], 
+    "items": [
+      {
+        "description": "футляри до державних нагород", 
+        "classification": {
+          "scheme": "ДК021", 
+          "description": "Cartons", 
+          "id": "44617100-9"
+        }, 
+        "additionalClassifications": [
+          {
+            "scheme": "ДКПП", 
+            "id": "17.21.1", 
+            "description": "папір і картон гофровані, паперова й картонна тара"
+          }
+        ], 
+        "deliveryAddress": {
+          "postalCode": "79000", 
+          "countryName": "Україна", 
+          "streetAddress": "вул. Банкова 1", 
+          "region": "м. Київ", 
+          "locality": "м. Київ"
+        }, 
+        "deliveryDate": {
+          "startDate": "2020-05-03T01:00:00+03:00", 
+          "endDate": "2020-05-06T01:00:00+03:00"
+        }, 
+        "id": "22efe85457d041aab3bc5a64aae6be0f", 
+        "unit": {
+          "code": "44617100-9", 
+          "name": "item"
+        }, 
+        "quantity": 5.0
+      }
+    ], 
+    "suppliers": [
+      {
+        "contactPoint": {
+          "email": "aagt@gmail.com", 
+          "telephone": "+380 (322) 91-69-30", 
+          "name": "Андрій Олексюк"
+        }, 
+        "scale": "sme", 
+        "name": "ДКП «Книга»", 
+        "identifier": {
+          "scheme": "UA-EDR", 
+          "id": "00137226", 
+          "uri": "http://www.sc.gov.ua/"
+        }, 
+        "address": {
+          "postalCode": "79013", 
+          "countryName": "Україна", 
+          "streetAddress": "вул. Островського, 34", 
+          "region": "Львівська область", 
+          "locality": "м. Львів"
+        }
+      }
+    ], 
+    "contractNumber": "contract #13111", 
+    "period": {
+      "startDate": "2020-05-01T01:00:03+03:00", 
+      "endDate": "2021-05-01T01:00:03+03:00"
+    }, 
+    "dateSigned": "2020-05-01T01:00:03+03:00", 
+    "value": {
+      "currency": "UAH", 
+      "amount": 238.0, 
+      "amountNet": 230.0, 
+      "valueAddedTaxIncluded": true
+    }, 
+    "date": "2020-05-01T01:00:01+03:00", 
+    "awardID": "85136c93a6b043469633be6f0e09aa8b", 
+    "id": "4f7b2b4c16f24c66897d0d18d57c05f3", 
+    "contractID": "UA-2020-05-01-000001-1"
+  }
+}
+
diff --git a/docs/source/tendering/http/tutorial/patch-cancellation.http b/docs/source/tendering/http/tutorial/patch-cancellation.http
index 4ad3ae6d85..27d9326037 100644
--- a/docs/source/tendering/http/tutorial/patch-cancellation.http
+++ b/docs/source/tendering/http/tutorial/patch-cancellation.http
@@ -1,7 +1,7 @@
-PATCH /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/cancellations/d4d0fafa7fbf40b8b171adc3651ed356/documents/2c95fa8b548444c08d8575bfc95f0bea?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 48
-Content-Type: application/json
+PATCH /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/cancellations/d4d0fafa7fbf40b8b171adc3651ed356/documents/2c95fa8b548444c08d8575bfc95f0bea?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 48
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -16,13 +16,13 @@ Content-Type: application/json; charset=UTF-8
   "data": {
     "hash": "md5:00000000000000000000000000000000", 
     "description": "Changed description", 
-    "title": "Notice.pdf", 
-    "url": "http://public-docs-sandbox.prozorro.gov.ua/get/888a378eb7764d1693a1fec763cb806f?KeyID=a8968c46&Signature=66iYlHWRzl%252BEJRqmPqx781kVoy2WJlTVVKmZsNxrbNcxI0ib35aJ507wHARZ0lNebq9cfxuwi161lXFPn2NEAw%253D%253D", 
     "format": "application/pdf", 
+    "url": "http://public-docs-sandbox.prozorro.gov.ua/get/888a378eb7764d1693a1fec763cb806f?KeyID=a8968c46&Signature=66iYlHWRzl%252BEJRqmPqx781kVoy2WJlTVVKmZsNxrbNcxI0ib35aJ507wHARZ0lNebq9cfxuwi161lXFPn2NEAw%253D%253D", 
+    "title": "Notice.pdf", 
     "documentOf": "tender", 
-    "datePublished": "2020-05-15T01:00:03+03:00", 
-    "id": "2c95fa8b548444c08d8575bfc95f0bea", 
-    "dateModified": "2020-05-15T01:00:03+03:00"
+    "datePublished": "2020-05-01T01:00:03+03:00", 
+    "dateModified": "2020-05-01T01:00:03+03:00", 
+    "id": "2c95fa8b548444c08d8575bfc95f0bea"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/register-2nd-bidder.http b/docs/source/tendering/http/tutorial/register-2nd-bidder.http
index 85e3e5c642..d4c078b4a2 100644
--- a/docs/source/tendering/http/tutorial/register-2nd-bidder.http
+++ b/docs/source/tendering/http/tutorial/register-2nd-bidder.http
@@ -1,7 +1,7 @@
-POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 1438
-Content-Type: application/json
+POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 1438
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -66,9 +66,9 @@ Location: http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed
         "url": "http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/694f980947ff4d0b870d9a18384f23fe/documents/ce114f673cf14b039c1ee9705b07c00b?download=9152e77768004ab1ba6b843902ac3f12", 
         "format": "application/pdf", 
         "documentOf": "tender", 
-        "datePublished": "2020-05-15T01:00:01+03:00", 
-        "id": "ce114f673cf14b039c1ee9705b07c00b", 
-        "dateModified": "2020-05-15T01:00:01+03:00"
+        "datePublished": "2020-05-01T01:00:01+03:00", 
+        "dateModified": "2020-05-01T01:00:01+03:00", 
+        "id": "ce114f673cf14b039c1ee9705b07c00b"
       }, 
       {
         "hash": "md5:00000000000000000000000000000000", 
@@ -76,9 +76,9 @@ Location: http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed
         "url": "http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/694f980947ff4d0b870d9a18384f23fe/documents/8baccb56ed4a44a18ef4c13ef8a4094b?download=99993315a2cd472f9387941fe22ee6d5", 
         "format": "application/pdf", 
         "documentOf": "tender", 
-        "datePublished": "2020-05-15T01:00:01+03:00", 
-        "id": "8baccb56ed4a44a18ef4c13ef8a4094b", 
-        "dateModified": "2020-05-15T01:00:01+03:00"
+        "datePublished": "2020-05-01T01:00:01+03:00", 
+        "dateModified": "2020-05-01T01:00:01+03:00", 
+        "id": "8baccb56ed4a44a18ef4c13ef8a4094b"
       }
     ], 
     "value": {
diff --git a/docs/source/tendering/http/tutorial/tender-contract-get-documents-again.http b/docs/source/tendering/http/tutorial/tender-contract-get-documents-again.http
index 2d2d84a446..8f2a2191db 100644
--- a/docs/source/tendering/http/tutorial/tender-contract-get-documents-again.http
+++ b/docs/source/tendering/http/tutorial/tender-contract-get-documents-again.http
@@ -1,5 +1,5 @@
-GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents HTTP/1.0
-Authorization: Bearer broker
+GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents HTTP/1.0
+Authorization: Bearer broker
 Host: lb-api-sandbox.prozorro.gov.ua
 
 Response: 200 OK
@@ -8,23 +8,25 @@ Content-Type: application/json; charset=UTF-8
   "data": [
     {
       "hash": "md5:00000000000000000000000000000000", 
+      "author": "tender_owner", 
       "title": "contract_first_document.doc", 
       "url": "http://public-docs-sandbox.prozorro.gov.ua/get/b97562e3f33c493297fd14dd6d8c50f0?KeyID=a8968c46&Signature=dQMvA4OqNyUhOiqC5GLb4uSEt49HDaSNcEbdsglo9C4Wq8XJDos68B7pBOwMEiRZWStfSwxaG5Hf8DZduhr9DA%253D%253D", 
       "format": "application/msword", 
       "documentOf": "tender", 
-      "datePublished": "2020-05-15T01:00:03+03:00", 
-      "id": "9f3ff556fde24588bb8d43242b4fe977", 
-      "dateModified": "2020-05-15T01:00:03+03:00"
+      "datePublished": "2020-05-01T01:00:03+03:00", 
+      "dateModified": "2020-05-01T01:00:03+03:00", 
+      "id": "9f3ff556fde24588bb8d43242b4fe977"
     }, 
     {
       "hash": "md5:00000000000000000000000000000000", 
+      "author": "tender_owner", 
       "title": "contract_second_document.doc", 
       "url": "http://public-docs-sandbox.prozorro.gov.ua/get/a2aa5b35517c445ca3778b7b25560cc9?KeyID=a8968c46&Signature=VkkdjRhMvrxZzXFjmULpNVxzcq52P09KEEXjD2Fe%252BBMNBH9FUupk0ZN6hHIwAFGr5lYmPcm2HzuX83tijpfOBw%253D%253D", 
       "format": "application/msword", 
       "documentOf": "tender", 
-      "datePublished": "2020-05-15T01:00:03+03:00", 
-      "id": "d0c4000793a24e009a3057b4434ae119", 
-      "dateModified": "2020-05-15T01:00:03+03:00"
+      "datePublished": "2020-05-01T01:00:03+03:00", 
+      "dateModified": "2020-05-01T01:00:03+03:00", 
+      "id": "d0c4000793a24e009a3057b4434ae119"
     }
   ]
 }
diff --git a/docs/source/tendering/http/tutorial/tender-contract-get-documents.http b/docs/source/tendering/http/tutorial/tender-contract-get-documents.http
index d8e2920ed5..0ef3dc5633 100644
--- a/docs/source/tendering/http/tutorial/tender-contract-get-documents.http
+++ b/docs/source/tendering/http/tutorial/tender-contract-get-documents.http
@@ -1,5 +1,5 @@
-GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents HTTP/1.0
-Authorization: Bearer broker
+GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents HTTP/1.0
+Authorization: Bearer broker
 Host: lb-api-sandbox.prozorro.gov.ua
 
 Response: 200 OK
@@ -8,13 +8,14 @@ Content-Type: application/json; charset=UTF-8
   "data": [
     {
       "hash": "md5:00000000000000000000000000000000", 
+      "author": "tender_owner", 
       "title": "contract_first_document.doc", 
       "url": "http://public-docs-sandbox.prozorro.gov.ua/get/b97562e3f33c493297fd14dd6d8c50f0?KeyID=a8968c46&Signature=dQMvA4OqNyUhOiqC5GLb4uSEt49HDaSNcEbdsglo9C4Wq8XJDos68B7pBOwMEiRZWStfSwxaG5Hf8DZduhr9DA%253D%253D", 
       "format": "application/msword", 
       "documentOf": "tender", 
-      "datePublished": "2020-05-15T01:00:03+03:00", 
-      "id": "9f3ff556fde24588bb8d43242b4fe977", 
-      "dateModified": "2020-05-15T01:00:03+03:00"
+      "datePublished": "2020-05-01T01:00:03+03:00", 
+      "dateModified": "2020-05-01T01:00:03+03:00", 
+      "id": "9f3ff556fde24588bb8d43242b4fe977"
     }
   ]
 }
diff --git a/docs/source/tendering/http/tutorial/tender-contract-upload-document.http b/docs/source/tendering/http/tutorial/tender-contract-upload-document.http
index 4c6b70e9b5..8afdbbb3d7 100644
--- a/docs/source/tendering/http/tutorial/tender-contract-upload-document.http
+++ b/docs/source/tendering/http/tutorial/tender-contract-upload-document.http
@@ -1,7 +1,7 @@
-POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 348
-Content-Type: application/json
+POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 348
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -19,13 +19,14 @@ Location: http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed
 {
   "data": {
     "hash": "md5:00000000000000000000000000000000", 
+    "author": "tender_owner", 
     "title": "contract_first_document.doc", 
     "url": "http://public-docs-sandbox.prozorro.gov.ua/get/b97562e3f33c493297fd14dd6d8c50f0?KeyID=a8968c46&Signature=dQMvA4OqNyUhOiqC5GLb4uSEt49HDaSNcEbdsglo9C4Wq8XJDos68B7pBOwMEiRZWStfSwxaG5Hf8DZduhr9DA%253D%253D", 
     "format": "application/msword", 
     "documentOf": "tender", 
-    "datePublished": "2020-05-15T01:00:03+03:00", 
-    "id": "9f3ff556fde24588bb8d43242b4fe977", 
-    "dateModified": "2020-05-15T01:00:03+03:00"
+    "datePublished": "2020-05-01T01:00:03+03:00", 
+    "dateModified": "2020-05-01T01:00:03+03:00", 
+    "id": "9f3ff556fde24588bb8d43242b4fe977"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/tender-contract-upload-second-document.http b/docs/source/tendering/http/tutorial/tender-contract-upload-second-document.http
index a550a489b3..4444682c0b 100644
--- a/docs/source/tendering/http/tutorial/tender-contract-upload-second-document.http
+++ b/docs/source/tendering/http/tutorial/tender-contract-upload-second-document.http
@@ -1,7 +1,7 @@
-POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 347
-Content-Type: application/json
+POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 347
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -19,13 +19,14 @@ Location: http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed
 {
   "data": {
     "hash": "md5:00000000000000000000000000000000", 
+    "author": "tender_owner", 
     "title": "contract_second_document.doc", 
     "url": "http://public-docs-sandbox.prozorro.gov.ua/get/a2aa5b35517c445ca3778b7b25560cc9?KeyID=a8968c46&Signature=VkkdjRhMvrxZzXFjmULpNVxzcq52P09KEEXjD2Fe%252BBMNBH9FUupk0ZN6hHIwAFGr5lYmPcm2HzuX83tijpfOBw%253D%253D", 
     "format": "application/msword", 
     "documentOf": "tender", 
-    "datePublished": "2020-05-15T01:00:03+03:00", 
-    "id": "d0c4000793a24e009a3057b4434ae119", 
-    "dateModified": "2020-05-15T01:00:03+03:00"
+    "datePublished": "2020-05-01T01:00:03+03:00", 
+    "dateModified": "2020-05-01T01:00:03+03:00", 
+    "id": "d0c4000793a24e009a3057b4434ae119"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/tender-contract-upload-sign-file-by-owner.http b/docs/source/tendering/http/tutorial/tender-contract-upload-sign-file-by-owner.http
new file mode 100644
index 0000000000..18b1ba0dbc
--- /dev/null
+++ b/docs/source/tendering/http/tutorial/tender-contract-upload-sign-file-by-owner.http
@@ -0,0 +1,35 @@
+POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 434
+Content-Type: application/json
+Host: lb-api-sandbox.prozorro.gov.ua
+DATA:
+{
+  "data": {
+    "hash": "md5:00000000000000000000000000000000", 
+    "title": "owner_first_document_sign.pkcs7", 
+    "url": "http://public-docs-sandbox.prozorro.gov.ua/get/13a0c52811684b1c90e594fb5fb765b4?KeyID=a8968c46&Signature=4vEihD3qAJ4PebZkzbnaP6u2vJhD7G3Cnl%2FkyXUnDvWJFLU3vvo%2FqOTq%2Bh3jIIIPh58r4Xv0SoQri1quukdKAw%3D%3D", 
+    "format": "application/pkcs7-signature", 
+    "documentOf": "document", 
+    "relatedItem": "9f3ff556fde24588bb8d43242b4fe977"
+  }
+}
+
+Response: 201 Created
+Content-Type: application/json; charset=UTF-8
+Location: http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents/44b59b91c2c3408d912e71197bcb2026
+{
+  "data": {
+    "dateModified": "2020-05-01T01:00:03+03:00", 
+    "hash": "md5:00000000000000000000000000000000", 
+    "format": "application/pkcs7-signature", 
+    "url": "http://public-docs-sandbox.prozorro.gov.ua/get/13a0c52811684b1c90e594fb5fb765b4?KeyID=a8968c46&Signature=H1uYxm2tSuPt1Sb%252BZn%2Ffzuu0rGGiNPPRYpE1PIpYlAnObArIskamOTmUyerpQZZm0PXZvOHjmCbkreYkWN4GAA%253D%253D", 
+    "author": "tender_owner", 
+    "documentOf": "document", 
+    "relatedItem": "9f3ff556fde24588bb8d43242b4fe977", 
+    "title": "owner_first_document_sign.pkcs7", 
+    "datePublished": "2020-05-01T01:00:03+03:00", 
+    "id": "44b59b91c2c3408d912e71197bcb2026"
+  }
+}
+
diff --git a/docs/source/tendering/http/tutorial/tender-contract-upload-sign-file-by-supplier.http b/docs/source/tendering/http/tutorial/tender-contract-upload-sign-file-by-supplier.http
new file mode 100644
index 0000000000..d45edd0959
--- /dev/null
+++ b/docs/source/tendering/http/tutorial/tender-contract-upload-sign-file-by-supplier.http
@@ -0,0 +1,35 @@
+POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents?acc_token=cfa7d625bdd049c79e3dfa84d8835a53 HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 435
+Content-Type: application/json
+Host: lb-api-sandbox.prozorro.gov.ua
+DATA:
+{
+  "data": {
+    "hash": "md5:00000000000000000000000000000000", 
+    "title": "supplier_first_document_sign.pkcs7", 
+    "url": "http://public-docs-sandbox.prozorro.gov.ua/get/4f1b9f5a45364f0cbb725e846b662238?KeyID=a8968c46&Signature=Anj2v1yWUYKKgDGOTSrm%2F2cCwUbJhn7mlhxn7TzrZOcNnNawXe6hQqovJX4gIQbV6scc%2Bnugf1DoQknw7dCmBA%3D%3D", 
+    "format": "application/pkcs7-signature", 
+    "documentOf": "document", 
+    "relatedItem": "9f3ff556fde24588bb8d43242b4fe977"
+  }
+}
+
+Response: 201 Created
+Content-Type: application/json; charset=UTF-8
+Location: http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/contracts/4f7b2b4c16f24c66897d0d18d57c05f3/documents/6433ef9dfe0443279db2f43f2a226561
+{
+  "data": {
+    "dateModified": "2020-05-01T01:00:03+03:00", 
+    "hash": "md5:00000000000000000000000000000000", 
+    "format": "application/pkcs7-signature", 
+    "url": "http://public-docs-sandbox.prozorro.gov.ua/get/4f1b9f5a45364f0cbb725e846b662238?KeyID=a8968c46&Signature=CVe5P9Wl2XZzgeb%2F2VXizVGxoyZ5PZmcSZPdZzb58LZXQ48PfznXpmJcGAzC65u3BgNoBfLxlwaAsU5oNDG%252BBg%253D%253D", 
+    "author": "contract_supplier", 
+    "documentOf": "document", 
+    "relatedItem": "9f3ff556fde24588bb8d43242b4fe977", 
+    "title": "supplier_first_document_sign.pkcs7", 
+    "datePublished": "2020-05-01T01:00:03+03:00", 
+    "id": "6433ef9dfe0443279db2f43f2a226561"
+  }
+}
+
diff --git a/docs/source/tendering/http/tutorial/tender-document-add-documentType.http b/docs/source/tendering/http/tutorial/tender-document-add-documentType.http
index 5016f7edbf..607cbd57ce 100644
--- a/docs/source/tendering/http/tutorial/tender-document-add-documentType.http
+++ b/docs/source/tendering/http/tutorial/tender-document-add-documentType.http
@@ -1,7 +1,7 @@
-PATCH /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents/8a3d30101dc94ca58f768bec6a1f45dd?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 53
-Content-Type: application/json
+PATCH /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents/8a3d30101dc94ca58f768bec6a1f45dd?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 53
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -14,16 +14,16 @@ Response: 200 OK
 Content-Type: application/json; charset=UTF-8
 {
   "data": {
+    "dateModified": "2020-05-01T01:00:01+03:00", 
     "hash": "md5:00000000000000000000000000000000", 
-    "author": "tender_owner", 
-    "title": "Notice.pdf", 
-    "url": "http://public-docs-sandbox.prozorro.gov.ua/get/4d52879c11df4aa7ae80d3b6c4a274ce?KeyID=a8968c46&Signature=BiR23Y26fUFdAaBBqxSqN2Lv29UkW8VjpoZA0NLoVj2cgKeSq3J%2FiuGzva%252Bl0R6wpgLbA2zfat9mNkErf3HjAg%253D%253D", 
     "format": "application/pdf", 
+    "url": "http://public-docs-sandbox.prozorro.gov.ua/get/4d52879c11df4aa7ae80d3b6c4a274ce?KeyID=a8968c46&Signature=BiR23Y26fUFdAaBBqxSqN2Lv29UkW8VjpoZA0NLoVj2cgKeSq3J%2FiuGzva%252Bl0R6wpgLbA2zfat9mNkErf3HjAg%253D%253D", 
+    "author": "tender_owner", 
     "documentOf": "tender", 
     "datePublished": "2020-05-15T01:00:01+03:00", 
     "documentType": "technicalSpecifications", 
-    "id": "8a3d30101dc94ca58f768bec6a1f45dd", 
-    "dateModified": "2020-05-15T01:00:01+03:00"
+    "title": "Notice.pdf", 
+    "id": "8a3d30101dc94ca58f768bec6a1f45dd"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/tender-document-edit-docType-desc.http b/docs/source/tendering/http/tutorial/tender-document-edit-docType-desc.http
index 5d14f0a6f6..9601b8e0cd 100644
--- a/docs/source/tendering/http/tutorial/tender-document-edit-docType-desc.http
+++ b/docs/source/tendering/http/tutorial/tender-document-edit-docType-desc.http
@@ -1,7 +1,7 @@
-PATCH /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents/8a3d30101dc94ca58f768bec6a1f45dd?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 58
-Content-Type: application/json
+PATCH /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents/8a3d30101dc94ca58f768bec6a1f45dd?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 58
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -16,15 +16,15 @@ Content-Type: application/json; charset=UTF-8
   "data": {
     "hash": "md5:00000000000000000000000000000000", 
     "description": "document description modified", 
-    "title": "Notice.pdf", 
+    "author": "tender_owner", 
     "url": "http://public-docs-sandbox.prozorro.gov.ua/get/4d52879c11df4aa7ae80d3b6c4a274ce?KeyID=a8968c46&Signature=BiR23Y26fUFdAaBBqxSqN2Lv29UkW8VjpoZA0NLoVj2cgKeSq3J%2FiuGzva%252Bl0R6wpgLbA2zfat9mNkErf3HjAg%253D%253D", 
     "format": "application/pdf", 
     "documentOf": "tender", 
-    "datePublished": "2020-05-15T01:00:01+03:00", 
-    "author": "tender_owner", 
+    "datePublished": "2020-05-01T01:00:01+03:00", 
     "documentType": "technicalSpecifications", 
     "id": "8a3d30101dc94ca58f768bec6a1f45dd", 
-    "dateModified": "2020-05-15T01:00:01+03:00"
+    "title": "Notice.pdf", 
+    "dateModified": "2020-05-01T01:00:01+03:00"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/tender-documents-2.http b/docs/source/tendering/http/tutorial/tender-documents-2.http
index 61c9c81082..edd3a9cb23 100644
--- a/docs/source/tendering/http/tutorial/tender-documents-2.http
+++ b/docs/source/tendering/http/tutorial/tender-documents-2.http
@@ -1,5 +1,5 @@
-GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents HTTP/1.0
-Authorization: Bearer broker
+GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents HTTP/1.0
+Authorization: Bearer broker
 Host: lb-api-sandbox.prozorro.gov.ua
 
 Response: 200 OK
@@ -9,15 +9,15 @@ Content-Type: application/json; charset=UTF-8
     {
       "hash": "md5:00000000000000000000000000000000", 
       "description": "document description modified", 
-      "title": "Notice.pdf", 
+      "author": "tender_owner", 
       "url": "http://public-docs-sandbox.prozorro.gov.ua/get/4d52879c11df4aa7ae80d3b6c4a274ce?KeyID=a8968c46&Signature=BiR23Y26fUFdAaBBqxSqN2Lv29UkW8VjpoZA0NLoVj2cgKeSq3J%2FiuGzva%252Bl0R6wpgLbA2zfat9mNkErf3HjAg%253D%253D", 
       "format": "application/pdf", 
       "documentOf": "tender", 
-      "datePublished": "2020-05-15T01:00:01+03:00", 
-      "author": "tender_owner", 
+      "datePublished": "2020-05-01T01:00:01+03:00", 
       "documentType": "technicalSpecifications", 
       "id": "8a3d30101dc94ca58f768bec6a1f45dd", 
-      "dateModified": "2020-05-15T01:00:01+03:00"
+      "title": "Notice.pdf", 
+      "dateModified": "2020-05-01T01:00:01+03:00"
     }, 
     {
       "hash": "md5:00000000000000000000000000000000", 
@@ -26,9 +26,9 @@ Content-Type: application/json; charset=UTF-8
       "url": "http://public-docs-sandbox.prozorro.gov.ua/get/55286412717f4997b35cde1cdc8ca4a3?KeyID=a8968c46&Signature=SLJwlJyNeYyhfqlj5fjfDUM5HpgwZKwSFTALjLjeIuv5mzql8Jjjua0WO8iNogqE6c0DA0%252BkyD8utzz3zI27BA%253D%253D", 
       "format": "application/pdf", 
       "documentOf": "tender", 
-      "datePublished": "2020-05-15T01:00:01+03:00", 
-      "id": "90a4fef3a0f545f4807445bbd4017f29", 
-      "dateModified": "2020-05-15T01:00:01+03:00"
+      "datePublished": "2020-05-01T01:00:01+03:00", 
+      "dateModified": "2020-05-01T01:00:01+03:00", 
+      "id": "90a4fef3a0f545f4807445bbd4017f29"
     }
   ]
 }
diff --git a/docs/source/tendering/http/tutorial/tender-documents-3.http b/docs/source/tendering/http/tutorial/tender-documents-3.http
index 22f0dc890f..2072ea2872 100644
--- a/docs/source/tendering/http/tutorial/tender-documents-3.http
+++ b/docs/source/tendering/http/tutorial/tender-documents-3.http
@@ -1,5 +1,5 @@
-GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents HTTP/1.0
-Authorization: Bearer broker
+GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents HTTP/1.0
+Authorization: Bearer broker
 Host: lb-api-sandbox.prozorro.gov.ua
 
 Response: 200 OK
@@ -9,15 +9,15 @@ Content-Type: application/json; charset=UTF-8
     {
       "hash": "md5:00000000000000000000000000000000", 
       "description": "document description modified", 
-      "title": "Notice.pdf", 
+      "author": "tender_owner", 
       "url": "http://public-docs-sandbox.prozorro.gov.ua/get/4d52879c11df4aa7ae80d3b6c4a274ce?KeyID=a8968c46&Signature=BiR23Y26fUFdAaBBqxSqN2Lv29UkW8VjpoZA0NLoVj2cgKeSq3J%2FiuGzva%252Bl0R6wpgLbA2zfat9mNkErf3HjAg%253D%253D", 
       "format": "application/pdf", 
       "documentOf": "tender", 
-      "datePublished": "2020-05-15T01:00:01+03:00", 
-      "author": "tender_owner", 
+      "datePublished": "2020-05-01T01:00:01+03:00", 
       "documentType": "technicalSpecifications", 
       "id": "8a3d30101dc94ca58f768bec6a1f45dd", 
-      "dateModified": "2020-05-15T01:00:01+03:00"
+      "title": "Notice.pdf", 
+      "dateModified": "2020-05-01T01:00:01+03:00"
     }, 
     {
       "hash": "md5:00000000000000000000000000000000", 
@@ -26,9 +26,9 @@ Content-Type: application/json; charset=UTF-8
       "url": "http://public-docs-sandbox.prozorro.gov.ua/get/5d1c2cddad3f45a3aac16cb29b81f97f?KeyID=a8968c46&Signature=E3RouA49wKUWYJ7BPlrzsmaNUW69ZPMHhlKAAOoUy3gSRyJaA98YqWOvmbQ30Z0oCAQ44WCDW4wlwGZV0RXjCA%253D%253D", 
       "format": "application/pdf", 
       "documentOf": "tender", 
-      "datePublished": "2020-05-15T01:00:01+03:00", 
-      "id": "90a4fef3a0f545f4807445bbd4017f29", 
-      "dateModified": "2020-05-15T01:00:01+03:00"
+      "datePublished": "2020-05-01T01:00:01+03:00", 
+      "dateModified": "2020-05-01T01:00:01+03:00", 
+      "id": "90a4fef3a0f545f4807445bbd4017f29"
     }
   ]
 }
diff --git a/docs/source/tendering/http/tutorial/tender-documents.http b/docs/source/tendering/http/tutorial/tender-documents.http
index 711e4ce7f0..d2db90b8b0 100644
--- a/docs/source/tendering/http/tutorial/tender-documents.http
+++ b/docs/source/tendering/http/tutorial/tender-documents.http
@@ -1,5 +1,5 @@
-GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents/8a3d30101dc94ca58f768bec6a1f45dd HTTP/1.0
-Authorization: Bearer broker
+GET /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents/8a3d30101dc94ca58f768bec6a1f45dd HTTP/1.0
+Authorization: Bearer broker
 Host: lb-api-sandbox.prozorro.gov.ua
 
 Response: 200 OK
@@ -14,8 +14,8 @@ Content-Type: application/json; charset=UTF-8
     "documentOf": "tender", 
     "datePublished": "2020-05-15T01:00:01+03:00", 
     "previousVersions": [], 
-    "id": "8a3d30101dc94ca58f768bec6a1f45dd", 
-    "dateModified": "2020-05-15T01:00:01+03:00"
+    "dateModified": "2020-05-01T01:00:01+03:00", 
+    "id": "8a3d30101dc94ca58f768bec6a1f45dd"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/update-award-criteria.http b/docs/source/tendering/http/tutorial/update-award-criteria.http
index a13388bf5e..d2d45279cb 100644
--- a/docs/source/tendering/http/tutorial/update-award-criteria.http
+++ b/docs/source/tendering/http/tutorial/update-award-criteria.http
@@ -1,7 +1,7 @@
-PUT /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents/90a4fef3a0f545f4807445bbd4017f29?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 329
-Content-Type: application/json
+PUT /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents/90a4fef3a0f545f4807445bbd4017f29?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 329
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -23,9 +23,9 @@ Content-Type: application/json; charset=UTF-8
     "url": "http://public-docs-sandbox.prozorro.gov.ua/get/5d1c2cddad3f45a3aac16cb29b81f97f?KeyID=a8968c46&Signature=E3RouA49wKUWYJ7BPlrzsmaNUW69ZPMHhlKAAOoUy3gSRyJaA98YqWOvmbQ30Z0oCAQ44WCDW4wlwGZV0RXjCA%253D%253D", 
     "format": "application/pdf", 
     "documentOf": "tender", 
-    "datePublished": "2020-05-15T01:00:01+03:00", 
-    "id": "90a4fef3a0f545f4807445bbd4017f29", 
-    "dateModified": "2020-05-15T01:00:01+03:00"
+    "datePublished": "2020-05-01T01:00:01+03:00", 
+    "dateModified": "2020-05-01T01:00:01+03:00", 
+    "id": "90a4fef3a0f545f4807445bbd4017f29"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/update-cancellation-doc.http b/docs/source/tendering/http/tutorial/update-cancellation-doc.http
index 60ac5abc72..5a526824c9 100644
--- a/docs/source/tendering/http/tutorial/update-cancellation-doc.http
+++ b/docs/source/tendering/http/tutorial/update-cancellation-doc.http
@@ -1,7 +1,7 @@
-PUT /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/cancellations/d4d0fafa7fbf40b8b171adc3651ed356/documents/2c95fa8b548444c08d8575bfc95f0bea?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 322
-Content-Type: application/json
+PUT /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/cancellations/d4d0fafa7fbf40b8b171adc3651ed356/documents/2c95fa8b548444c08d8575bfc95f0bea?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 322
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -19,13 +19,13 @@ Content-Type: application/json; charset=UTF-8
   "data": {
     "hash": "md5:00000000000000000000000000000000", 
     "description": "Changed description", 
-    "title": "Notice-2.pdf", 
-    "url": "http://public-docs-sandbox.prozorro.gov.ua/get/c9f250e2f74e4e8e95a882add5b4401a?KeyID=a8968c46&Signature=zr1a4Vd8WIGqoGAskp1DDf5%252BQzA6WJ5nV1uzXJIgIc3nK%2FJFCw%252BGK4aIT7vCv8qv8WTHWJ4%252BN%2Fb5gGIWIzYKAQ%253D%253D", 
     "format": "application/pdf", 
+    "url": "http://public-docs-sandbox.prozorro.gov.ua/get/c9f250e2f74e4e8e95a882add5b4401a?KeyID=a8968c46&Signature=zr1a4Vd8WIGqoGAskp1DDf5%252BQzA6WJ5nV1uzXJIgIc3nK%2FJFCw%252BGK4aIT7vCv8qv8WTHWJ4%252BN%2Fb5gGIWIzYKAQ%253D%253D", 
+    "title": "Notice-2.pdf", 
     "documentOf": "tender", 
-    "datePublished": "2020-05-15T01:00:03+03:00", 
-    "id": "2c95fa8b548444c08d8575bfc95f0bea", 
-    "dateModified": "2020-05-15T01:00:03+03:00"
+    "datePublished": "2020-05-01T01:00:03+03:00", 
+    "dateModified": "2020-05-01T01:00:03+03:00", 
+    "id": "2c95fa8b548444c08d8575bfc95f0bea"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/upload-award-criteria.http b/docs/source/tendering/http/tutorial/upload-award-criteria.http
index 4a1a3da4f4..8dfb72f555 100644
--- a/docs/source/tendering/http/tutorial/upload-award-criteria.http
+++ b/docs/source/tendering/http/tutorial/upload-award-criteria.http
@@ -1,7 +1,7 @@
-POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 337
-Content-Type: application/json
+POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 337
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -24,9 +24,9 @@ Location: http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed
     "url": "http://public-docs-sandbox.prozorro.gov.ua/get/55286412717f4997b35cde1cdc8ca4a3?KeyID=a8968c46&Signature=SLJwlJyNeYyhfqlj5fjfDUM5HpgwZKwSFTALjLjeIuv5mzql8Jjjua0WO8iNogqE6c0DA0%252BkyD8utzz3zI27BA%253D%253D", 
     "format": "application/pdf", 
     "documentOf": "tender", 
-    "datePublished": "2020-05-15T01:00:01+03:00", 
-    "id": "90a4fef3a0f545f4807445bbd4017f29", 
-    "dateModified": "2020-05-15T01:00:01+03:00"
+    "datePublished": "2020-05-01T01:00:01+03:00", 
+    "dateModified": "2020-05-01T01:00:01+03:00", 
+    "id": "90a4fef3a0f545f4807445bbd4017f29"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/upload-bid-proposal.http b/docs/source/tendering/http/tutorial/upload-bid-proposal.http
index 24fb697995..829d7c66d3 100644
--- a/docs/source/tendering/http/tutorial/upload-bid-proposal.http
+++ b/docs/source/tendering/http/tutorial/upload-bid-proposal.http
@@ -1,7 +1,7 @@
-POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/b31ec66637a141c7bb03446a0f22f5dc/documents?acc_token=7a7e299c46ba4430a2a63af9bf91af30 HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 326
-Content-Type: application/json
+POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/b31ec66637a141c7bb03446a0f22f5dc/documents?acc_token=7a7e299c46ba4430a2a63af9bf91af30 HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 326
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -23,9 +23,9 @@ Location: http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed
     "url": "http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/bids/b31ec66637a141c7bb03446a0f22f5dc/documents/86cd9a1b304d4530852984610d67c933?download=748412273ae54b27a3606febdfe1bc93", 
     "format": "application/pdf", 
     "documentOf": "tender", 
-    "datePublished": "2020-05-15T01:00:01+03:00", 
-    "id": "86cd9a1b304d4530852984610d67c933", 
-    "dateModified": "2020-05-15T01:00:01+03:00"
+    "datePublished": "2020-05-01T01:00:01+03:00", 
+    "dateModified": "2020-05-01T01:00:01+03:00", 
+    "id": "86cd9a1b304d4530852984610d67c933"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/upload-cancellation-doc.http b/docs/source/tendering/http/tutorial/upload-cancellation-doc.http
index 1646fe03ea..8b1d20bc87 100644
--- a/docs/source/tendering/http/tutorial/upload-cancellation-doc.http
+++ b/docs/source/tendering/http/tutorial/upload-cancellation-doc.http
@@ -1,7 +1,7 @@
-POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/cancellations/d4d0fafa7fbf40b8b171adc3651ed356/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 326
-Content-Type: application/json
+POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/cancellations/d4d0fafa7fbf40b8b171adc3651ed356/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 326
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -23,9 +23,9 @@ Location: http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed
     "url": "http://public-docs-sandbox.prozorro.gov.ua/get/888a378eb7764d1693a1fec763cb806f?KeyID=a8968c46&Signature=66iYlHWRzl%252BEJRqmPqx781kVoy2WJlTVVKmZsNxrbNcxI0ib35aJ507wHARZ0lNebq9cfxuwi161lXFPn2NEAw%253D%253D", 
     "format": "application/pdf", 
     "documentOf": "tender", 
-    "datePublished": "2020-05-15T01:00:03+03:00", 
-    "id": "2c95fa8b548444c08d8575bfc95f0bea", 
-    "dateModified": "2020-05-15T01:00:03+03:00"
+    "datePublished": "2020-05-01T01:00:03+03:00", 
+    "dateModified": "2020-05-01T01:00:03+03:00", 
+    "id": "2c95fa8b548444c08d8575bfc95f0bea"
   }
 }
 
diff --git a/docs/source/tendering/http/tutorial/upload-tender-notice.http b/docs/source/tendering/http/tutorial/upload-tender-notice.http
index bfab3552d7..e26f608fcf 100644
--- a/docs/source/tendering/http/tutorial/upload-tender-notice.http
+++ b/docs/source/tendering/http/tutorial/upload-tender-notice.http
@@ -1,7 +1,7 @@
-POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
-Authorization: Bearer broker
-Content-Length: 326
-Content-Type: application/json
+POST /api/2.5/tenders/bc3a9016b29d4fed894cc62d3ff59680/documents?acc_token=e6bb69a4c5474e4987130585951b6f3e HTTP/1.0
+Authorization: Bearer broker
+Content-Length: 326
+Content-Type: application/json
 Host: lb-api-sandbox.prozorro.gov.ua
 DATA:
 {
@@ -24,9 +24,9 @@ Location: http://lb-api-sandbox.prozorro.gov.ua/api/2.5/tenders/bc3a9016b29d4fed
     "url": "http://public-docs-sandbox.prozorro.gov.ua/get/4d52879c11df4aa7ae80d3b6c4a274ce?KeyID=a8968c46&Signature=BiR23Y26fUFdAaBBqxSqN2Lv29UkW8VjpoZA0NLoVj2cgKeSq3J%2FiuGzva%252Bl0R6wpgLbA2zfat9mNkErf3HjAg%253D%253D", 
     "format": "application/pdf", 
     "documentOf": "tender", 
-    "datePublished": "2020-05-15T01:00:01+03:00", 
-    "id": "8a3d30101dc94ca58f768bec6a1f45dd", 
-    "dateModified": "2020-05-15T01:00:01+03:00"
+    "datePublished": "2020-05-01T01:00:01+03:00", 
+    "dateModified": "2020-05-01T01:00:01+03:00", 
+    "id": "8a3d30101dc94ca58f768bec6a1f45dd"
   }
 }
 
diff --git a/docs/tests/test_belowthreshold.py b/docs/tests/test_belowthreshold.py
index 86a769a84f..7a7b0252d5 100644
--- a/docs/tests/test_belowthreshold.py
+++ b/docs/tests/test_belowthreshold.py
@@ -2,6 +2,8 @@
 import os
 from copy import deepcopy
 from uuid import uuid4
+
+import jmespath
 from datetime import timedelta
 
 from openprocurement.api.models import get_now
@@ -468,6 +470,8 @@ def test_docs_tutorial(self):
                 }})
             self.assertEqual(response.status, '201 Created')
 
+            contract_first_document_id = response.json["data"]["id"]
+
         with open(TARGET_DIR + 'tutorial/tender-contract-get-documents.http', 'w') as self.app.file_obj:
             response = self.app.get('/tenders/{}/contracts/{}/documents'.format(
                 self.tender_id, self.contract_id))
@@ -484,6 +488,7 @@ def test_docs_tutorial(self):
                     'format': 'application/msword',
                 }})
             self.assertEqual(response.status, '201 Created')
+            contract_second_document_id = response.json["data"]["id"]
 
         with open(TARGET_DIR + 'tutorial/tender-contract-get-documents-again.http', 'w') as self.app.file_obj:
             response = self.app.get('/tenders/{}/contracts/{}/documents'.format(
@@ -499,20 +504,93 @@ def test_docs_tutorial(self):
                 {'data': {"dateSigned": get_now().isoformat()}})
             self.assertEqual(response.status, '200 OK')
 
-        #### Contract signing
+       #### Contract signing procedure
+        # Checking if contract has the `pending` status
+
+        with open(TARGET_DIR + 'tutorial/get-tender-contracts.http', 'w') as self.app.file_obj:
+            response = self.app.get("/tenders/{}/contracts/{}".format(self.tender_id, self.contract_id))
+            self.assertEqual(response.json["data"]["status"], "pending")
+            contract = response.json["data"]
+            contract_id = contract["id"]
+        
+
+        # Contract preparation 
+
+        # To identify a winner supplier we need to find a bid which owner won an auction.
+        # Bid and award should be in the status `active`. 
 
         tender = self.db.get(self.tender_id)
-        for i in tender.get('awards', []):
-            i['complaintPeriod']['endDate'] = i['complaintPeriod']['startDate']
+        bid_id = jmespath.search("awards[?id=='{}'].bid_id".format(contract["awardID"]), tender)[0]
+        bid_token = jmespath.search("bids[?id=='{}'].owner_token".format(bid_id), tender)[0]
+
+        for bid in tender.get("bids", []):
+            if bid["id"] == bid_id and bid["status"] == "pending":
+                bid["status"] = "active"
+        for i in tender.get("awards", []):
+            if 'complaintPeriod' in i:
+                i["complaintPeriod"]["endDate"] = i["complaintPeriod"]["startDate"]
+        if 'value' in tender['contracts'][0] and tender['contracts'][0]['value']['valueAddedTaxIncluded']:
+            tender['contracts'][0]['value']['amountNet'] = str(float(tender['contracts'][0]['value']['amount']) - 1)
         self.db.save(tender)
 
-        with open(TARGET_DIR + 'tutorial/tender-contract-sign.http', 'w') as self.app.file_obj:
+        # Changing a contract status to `pending.winner-signing` by the tender owner
+
+        with open(TARGET_DIR + 'tutorial/change-contract-status-to-pending-winner-signing-by-owner.http', 'w') as self.app.file_obj:
             response = self.app.patch_json(
-                '/tenders/{}/contracts/{}?acc_token={}'.format(
-                    self.tender_id, self.contract_id, owner_token),
-                {'data': {'status': 'active'}})
-            self.assertEqual(response.status, '200 OK')
+                "/tenders/{}/contracts/{}?acc_token={}".format(self.tender_id, self.contract_id, owner_token),
+                {"data": {"status": "pending.winner-signing"}}
+            )
+            self.assertEqual(response.status, "200 OK")
+        
+        # Uploading a sign document to the contract document by supplier 
 
+        with open(TARGET_DIR + 'tutorial/tender-contract-upload-sign-file-by-supplier.http', 'w') as self.app.file_obj:
+            response = self.app.post_json(
+                "/tenders/{}/contracts/{}/documents?acc_token={}".format(self.tender_id, self.contract_id, bid_token),
+                {
+                        "data": {
+                            "title": u"supplier_first_document_sign.pkcs7",
+                            "url": self.generate_docservice_url(),
+                            "hash": "md5:" + "0" * 32,
+                            "format": "application/pkcs7-signature",
+                            "documentOf": "document",
+                            "relatedItem": contract_first_document_id,
+                        }
+                    },
+                    status=201
+                )
+            self.assertEqual(response.status, "201 Created")
+            doc_id = response.json["data"]["id"]
+
+        # Changing a contract status to `pending` by supplier
+
+        with open(TARGET_DIR + 'tutorial/change-contract-status-to-pending-by-supplier.http', 'w') as self.app.file_obj:
+            response = self.app.patch_json(
+                "/tenders/{}/contracts/{}?acc_token={}".format(self.tender_id, contract_id, bid_token),
+                {"data": {"status": "pending"}}
+            )
+        self.assertEqual(response.status, "200 OK")
+
+        # Uploading a sign document to the contract document by owner 
+
+        with open(TARGET_DIR + 'tutorial/tender-contract-upload-sign-file-by-owner.http', 'w') as self.app.file_obj:
+
+            response = self.app.post_json(
+                "/tenders/{}/contracts/{}/documents?acc_token={}".format(self.tender_id, self.contract_id, owner_token),
+                {
+                        "data": {
+                            "title": u"owner_first_document_sign.pkcs7",
+                            "url": self.generate_docservice_url(),
+                            "hash": "md5:" + "0" * 32,
+                            "format": "application/pkcs7-signature",
+                            "documentOf": "document",
+                            "relatedItem": contract_first_document_id,
+                        }
+                    },
+                    status=201
+                )
+            self.assertEqual(response.status, "201 Created")
+            
         # Preparing the cancellation request
 
         self.set_status('active.awarded')