Is it possible to use Huawei developer API via Google Apps Script?

1 According to this guide I created API Client;

2 I try to run this Apps Script to get access token and get error 502.

var url = "https://connect-api.cloud.huawei.com/api/oauth2/v1/token";

  var options =
  {
    "method" : "POST",
    "contentType" : "application/json",    
    "payload" : {
      "grant_type" : "client_credentials",
      "client_id" : "700000000000000000",
      "client_secret" : "4*********************A"
    }
  };

  var response = UrlFetchApp.fetch( url, options);
  Logger.log(response);

Is anybody can test this small code? Have you propositions?

Fixed!

var url = "https://connect-api.cloud.huawei.com/api/oauth2/v1/token";  
  var options =
    {
      method : "POST",
      contentType : "application/json",
      payload:JSON.stringify({
        "grant_type":"client_credentials",
        "client_id":"000000000000000000",            
        "client_secret":"LONG_STRING"
      })      
    };

  var response = UrlFetchApp.fetch( url, options);
  var access_token = JSON.parse(response.getContentText()).access_token;