Merge pull request #219 from liamjcooper/fix/access-token-exception

Throw an exception if the access token request failed

Author: tareqtms

lib/AuthHelper.php

@@ -170,6 +170,10 @@ public static function getAccessToken()
 
             $response = HttpRequestJson::post($config['AdminUrl'] . 'oauth/access_token', $data);
 
+            if (CurlRequest::$lastHttpCode >= 400) {
+                throw new SdkException("The shop is invalid or the authorization code has already been used.");
+            }
+
             return isset($response['access_token']) ? $response['access_token'] : null;
         } else {
             throw new SdkException("This request is not initiated from a valid shopify shop!");