diff --git a/README.md b/README.md
index 8051bae..bf17110 100644
--- a/README.md
+++ b/README.md
@@ -186,6 +186,19 @@ if (OrderStatus::isDeclined($result['orderStatus'])) {
 }
 ```
 
+Also, you can get an order's status by using you own identifier (e.g. assigned by your database):
+
+```php
+<?php
+
+use Voronkovich\SberbankAcquiring\Client;
+use Voronkovich\SberbankAcquiring\OrderStatus;
+
+$client = new Client(['userName' => 'username', 'password' => 'password']);
+
+$result = $client->getOrderStatusByOwnId($orderId);
+```
+
 ### Reversing an exising order
 
 [/payment/rest/reverse.do](https://securepayments.sberbank.ru/wiki/doku.php/integration:api:rest:requests:reverse)
diff --git a/src/Client.php b/src/Client.php
index 2be117c..3b8c4ca 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -301,11 +301,11 @@ public function refundOrder($orderId, int $amount, array $data = []): array
     }
 
     /**
-     * Get an existing order's status.
+     * Get an existing order's status by Sberbank's gateway identifier.
      *
      * @see https://securepayments.sberbank.ru/wiki/doku.php/integration:api:rest:requests:getorderstatusextended
      *
-     * @param int|string $orderId An order identifier
+     * @param int|string $orderId A Sberbank's gateway order identifier
      * @param array      $data    Additional data
      *
      * @return array A server's response
@@ -317,6 +317,23 @@ public function getOrderStatus($orderId, array $data = []): array
         return $this->execute($this->prefixDefault . 'getOrderStatusExtended.do', $data);
     }
 
+    /**
+     * Get an existing order's status by own identifier.
+     *
+     * @see https://securepayments.sberbank.ru/wiki/doku.php/integration:api:rest:requests:getorderstatusextended
+     *
+     * @param int|string $orderId An own order identifier
+     * @param array      $data    Additional data
+     *
+     * @return array A server's response
+     */
+    public function getOrderStatusByOwnId($orderId, array $data = []): array
+    {
+        $data['orderNumber'] = $orderId;
+
+        return $this->execute($this->prefixDefault . 'getOrderStatusExtended.do', $data);
+    }
+
     /**
      * Verify card enrollment in the 3DS.
      *
diff --git a/tests/ClientTest.php b/tests/ClientTest.php
index 9ffb7a8..b1248dd 100644
--- a/tests/ClientTest.php
+++ b/tests/ClientTest.php
@@ -385,6 +385,21 @@ public function testGetsAnOrderStatus()
         $client->getOrderStatus('aaa-bbb-yyy', ['currency' => 100]);
     }
 
+    public function testGetsAnOrderStatusByOwnId()
+    {
+        $httpClient = $this->getHttpClientToTestSendingData(
+            '/rest/getOrderStatusExtended.do',
+            'currency=100&orderNumber=111&token=abrakadabra'
+        );
+
+        $client = new Client([
+            'token' => 'abrakadabra',
+            'httpClient' => $httpClient,
+        ]);
+
+        $client->getOrderStatusByOwnId(111, ['currency' => 100]);
+    }
+
     public function testVerifiesACardEnrollment()
     {
         $httpClient = $this->getHttpClientToTestSendingData(