talk.js

var fetch = require('node-fetch');

var appId = "YOUR_APP_ID";
var secret = "YOUR_SECRET_KEY";
var userId = "3918" // replace with ID of the user from your own database.

var url = `https://api.talkjs.com/v1/${appId}/users/{userId}`;
var body = {
  name: "John Doe"
  email: ["john@doe.com"]
};

fetch(url, {
  method: 'POST',
  headers: {
    'Authorization' : secret,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify(body) // important to JSON stringify the content
})
  .then(x => x.json());