instance.js

var sa = require('superagent');

sa.post('https://ip-messaging.twilio.com/v1/Services')
    .auth(process.env.TWILIO_ACCOUNT_SID, process.env.TWILIO_AUTH_TOKEN)
    .type('form')
    .send({
        FriendlyName: 'Super Awesome App'
    })
    .end(function(err, res) {
        console.log(res.body.sid);
    });

server.js

var express = require('express');
var twilio = require('twilio');

var app = express();
app.use(express.static(__dirname+'/public'));

app.get('/token', function(request, response) {
    var capability = new twilio.Capability();

    capability.allowClientOutgoing('', {
        service_sid: 'ISeaea27ce5b404009a7a316e9eb57d003',
        identity: request.query.id,
        endpoint_id: 'MyChat:browser:' + request.query.id
    });

    response.send(capability.generate());
});

app.get('/message', function(request, response) {
    var sa = require('superagent');

    sa.post('https://ip-messaging.twilio.com/v1/Services/ISeaea27ce5b404009a7a316e9eb57d003/Channels/CH45149a05faeb49b0a68107d9d3903f4a/Messages')
        .auth(process.env.TWILIO_ACCOUNT_SID, process.env.TWILIO_AUTH_TOKEN)
        .type('form')
        .send({
            Body: request.query.Body
        })
        .end(function(err, res) {
            console.log(res.body.sid);
        });
});

app.listen(3000);