Update Api.php

app/Api.php

@@ -11,7 +11,7 @@ class Api {
         curl_setopt($curl, CURLOPT_URL, $url);
         curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-type: application/json'));
         curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
+        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
         $result = curl_exec($curl);
         curl_close($curl);
         return $result;