HTTP/1.1 400 Bad Request
Server: lighttpd
Content-Length: 65
Content-Type: application/json; charset=utf-8
X-Application-Error: Duplicate merchant reference
Expires: Wed, 03 Aug 2016 05:45:54 GMT
Cache-Control: max-age=0, no-cache, no-store
Pragma: no-cache
Date: Wed, 03 Aug 2016 05:45:54 GMT
Connection: close

{"error":{"code":"400","message":"Duplicate merchant reference"}}