create.js

'use strict';

var key = 'YOURAPIKEY'
  , SparkPost = require('sparkpost')
  , client = new SparkPost(key)
  , webhook = {
    name: 'Test Relay Webhook',
    target: 'http://client.test.com/test-webhook',
    match: {
      domain: 'inbound.example.com'
    }
  };

  // Promise
client.relayWebhooks.create(webhook)
  .then(data => {
    console.log('Congrats you can use our client library!');
    console.log(data);
  })
  .catch(err => {
    console.log('Whoops! Something went wrong');
    console.log(err);
  });

// Callback
client.relayWebhooks.create(webhook, function(err, data) {
  if (err) {
    console.log('Whoops! Something went wrong');
    console.log(err);
  } else {
    console.log('Congrats you can use our client library!');
    console.log(data);
  }
});