CHECKOUT211: Checkout empty response
What this means
The store returned no checkout result, so the order status is unknown.
Check whether the order was created before trying checkout again.
Your data
The outcome could not be confirmed — verify before retrying. If this persists, export diagnostics and contact WCPOS support.
Troubleshoot
Check whether the order exists first — an empty response often means the order was created but the confirmation never arrived. On WCPOS Pro, sync the POS and look in the till's Orders list; otherwise have someone check WooCommerce → Orders in WP Admin. Only retry checkout once you have confirmed no order was created.
On the store — for the site administrator:
- Check WooCommerce → Status → Logs for a fatal error during checkout — a PHP crash after the order is created produces exactly this.
- If WooCommerce's log shows nothing, ask the hosting provider for the server's PHP error log — some fatal errors are captured only there.
For a developer: in the browser's developer tools — or the desktop app's Advanced → Toggle Developer Tools — the checkout request on the Network tab with a success status but an empty or truncated body points at a plugin or server buffer cutting the response short.