Make customer reference optionnal

Author: AntoineLemaire

src/Message/CancelSubscriptionRequest.php

@@ -52,7 +52,11 @@ public function getData()
 
     public function getEndpoint()
     {
-        return $this->endpoint.'/subscriptions/'.$this->getSubscriptionReference();
+        return $this->getCustomerReference() ?
+            $this->endpoint
+                .'/customers/'.$this->getCustomerReference()
+                .'/subscriptions/'.$this->getSubscriptionReference() :
+            $this->endpoint.'/subscriptions/'.$this->getSubscriptionReference();
     }
 
     public function getHttpMethod()

src/Message/FetchSubscriptionRequest.php

@@ -36,15 +36,17 @@ public function setSubscriptionReference($value)
 
     public function getData()
     {
-        $this->validate('customerReference', 'subscriptionReference');
+        $this->validate('subscriptionReference');
 
         return array();
     }
 
     public function getEndpoint()
     {
-        return $this->endpoint.'/customers/'.$this->getCustomerReference()
-            .'/subscriptions/'.$this->getSubscriptionReference();
+        return $this->getCustomerReference() ?
+            $this->endpoint.'/customers/'.$this->getCustomerReference()
+            .'/subscriptions/'.$this->getSubscriptionReference() :
+            $this->endpoint.'/subscriptions/'.$this->getSubscriptionReference();
     }
 
     public function getHttpMethod()

src/Message/UpdateSubscriptionRequest.php

@@ -99,6 +99,9 @@ public function getData()
 
     public function getEndpoint()
     {
-        return $this->endpoint.'/subscriptions/'.$this->getSubscriptionReference();
+        return $this->getCustomerReference() ?
+            $this->endpoint.'/customers/'.$this->getCustomerReference()
+                .'/subscriptions/'.$this->getSubscriptionReference() :
+            $this->endpoint.'/subscriptions/'.$this->getSubscriptionReference();
     }
 }