// API callback
googleMapsScriptLoaded' (t.api_key?({
  "error": {
    "code": 400,
    "message": "Invalid JSONP callback name: 'googleMapsScriptLoaded' (t.api_key?'; only alphabet, number, '_', '$', '.', '[' and ']' are allowed.",
    "status": "INVALID_ARGUMENT"
  }
}
);