Fix parameter cancel_at_period_end

Author: AntoineLemaire

src/Message/UpdateSubscriptionRequest.php

@@ -74,6 +74,19 @@ public function setSubscriptionReference($value)
         return $this->setParameter('subscriptionReference', $value);
     }
 
+    /**
+     * @return bool
+     */
+    public function getCancelAtPeriodEnd()
+    {
+        return $this->getParameter('cancel_at_period_end');
+    }
+
+    public function setCancelAtPeriodEnd($value)
+    {
+        return $this->setParameter('cancel_at_period_end', $value);
+    }
+
     public function getData()
     {
         $this->validate('subscriptionReference', 'plan');
@@ -87,7 +100,7 @@ public function getData()
         }
 
         if ($this->parameters->has('cancel_at_period_end')) {
-            $data['cancel_at_period_end'] = (bool)$this->getParameter('cancel_at_period_end');
+            $data['cancel_at_period_end'] = (bool)$this->getCancelAtPeriodEnd();
         }
 
         if ($this->getMetadata()) {