Added ShippingMethod::isZoneRestricted/isNotZoneRestricted methods

Changelog.md

@@ -21,6 +21,7 @@
 - Added and extended Foundation Channel model that contains the known relationships to the "channelable" models
 - Added the `withinChannel[s]` methods to the ProductSearch class
 - Added the `Features` accessor class, which is a syntactic sugar for areas of the configuration
+- Added `isZoneRestricted()` & `isNotZoneRestricted()` helper methods to the `ShippingMethod` class
 - Fixed possible null return type on Billpayer::getName() when is_organization is true but the company name is null
 
 ## 3.x Series

src/Shipment/Changelog.md

@@ -9,6 +9,7 @@
 - Dropped Laravel 9 Support
 - Dropped Enum v3 Support
 - Changed minimal Enum requirement to v4.1
+- Added `isZoneRestricted()` & `isNotZoneRestricted()` helper methods to the `ShippingMethod` class
 
 ## 3.x Series
 

src/Shipment/Models/ShippingMethod.php

@@ -85,6 +85,16 @@ public function estimate(?object $subject = null): ShippingFee
         return $this->getCalculator()->calculate($subject, $this->configuration());
     }
 
+    public function isZoneRestricted(): bool
+    {
+        return null !== $this->zone_id;
+    }
+
+    public function isNotZoneRestricted(): bool
+    {
+        return !$this->isZoneRestricted();
+    }
+
     public function zone(): BelongsTo
     {
         return $this->belongsTo(ZoneProxy::modelClass(), 'zone_id', 'id');