Assign a specified customer to a specified shopping cart

README.md

@@ -253,6 +253,13 @@ Apply a coupon to a specified cart.
 Magento::api('guestCarts')->couponCode($cartId, $couponCode);
 ```
 
+`/V1/guest-carts/{cartId}`
+
+Assign a specified customer to a specified shopping cart.
+```php
+Magento::api('guestCarts')->assignCustomer($cartId, $customerId, $storeId);
+```
+
 <a id="orders"></a>
 ### Orders (salesOrderRepositoryV1)
 

src/Api/GuestCarts.php

@@ -168,4 +168,20 @@ public function removeCoupons($cartId)
     {
         return $this->delete('/guest-carts/'.$cartId.'/coupons');
     }
+
+    /**
+     * Assign a specified customer to a specified shopping cart.
+     *
+     * @param  string   $cartId
+     * @param  int  $customerId
+     * @param  int  $storeId
+     * @return array
+     */
+    public function assignCustomer($cartId, $customerId, $storeId)
+    {
+        return $this->put('/guest-carts/'.$cartId, [
+            'customerId' => $customerId,
+            'storeId' => $storeId,
+        ]);
+    }
 }

tests/Api/GuestCartsTest.php

@@ -156,4 +156,15 @@ public function test_can_edit_item()
 
         $this->assertTrue($api->ok());
     }
+
+    public function test_it_can_assign_customer()
+    {
+        Http::fake([
+            '*rest/all/V1/guest-carts/foo' => Http::response([], 200),
+        ]);
+
+        $api = MagentoFacade::api('guestCarts')->assignCustomer('foo', 1, 1);
+
+        $this->assertTrue($api->ok());
+    }
 }