print-1.js

/**
 * This is the endpoint WC needs to post through a webhook to,
 * when a new sale has been made.
 */
app.post('/print', function (req, res) {
    var webhookBody      = req.body || {};
    var webhookSignature = req.headers['x-wc-webhook-signature'];

    console.log('Receiving webhook...');

    if (!webhookBody || !webhookSignature) {
        console.log('Access denied - invalid request');

        return res.send('access denied', 'invalid request', null, 403);
    }