Allow 202 response to be treated as success for create session response

Author: Mark O'Keeffe

src/Message/CreateSessionResponse.php

@@ -4,6 +4,23 @@
 
 class CreateSessionResponse extends AbstractResponse
 {
+    /**
+     * Is the transaction successful?
+     * @return boolean True if successful
+     */
+    public function isSuccessful()
+    {
+        // get response code
+        $code = $this->getHttpResponseCode();
+
+        return ($code === 200 || $code === 201 || $code === 202);
+    }
+
+    public function isPending()
+    {
+        return false;
+    }
+
     public function getSessionId()
     {
         return $this->getData('id');