var request = require("request");

​

var options = {

  method: 'POST',

  url: 'https://api.ultramsg.com/instance1150/messages/chat',

  headers: {'content-type': 'application/x-www-form-urlencoded'},

  form: {

    token: 'Instance_token',

    to: '14155552671',

    body: 'WhatsApp API on UltraMsg.com works good',

    priority: '10',

    referenceId: ''

  }

};

​

request(options, function (error, response, body) {

  if (error) throw new Error(error);

​

  console.log(body);

});