Get your webhook endpoint from Settings → Snipcart → Webhooks tab in the plugin settings and add it to the Webhooks URL field in Snipcart's control panel (opens new window).
That's it! Now Snipcart will post data to your Craft site as stuff happens with the store. Live webhooks will automatically be secured and validated (opens new window), and when devMode is enabled all webhook posts will be allowed through.
Webhook transactions are logged under Requests History in the Snipcart control panel, so you can confirm success or investigate problems there.