// API callback
?({
  "error": {
    "code": 400,
    "message": "Invalid JSONP callback name: '?'; only alphabet, number, '_', '$', '.', '[' and ']' are allowed.",
    "errors": [
      {
        "message": "Invalid JSONP callback name: '?'; only alphabet, number, '_', '$', '.', '[' and ']' are allowed.",
        "domain": "global",
        "reason": "badRequest"
      }
    ],
    "status": "INVALID_ARGUMENT"
  }
}
);