WooCommerce allows customers to pay for their orders using a special link that looks like this:
This is also used by some gateways that immediately redirect you to the order-pay endpoint after checkout. Previously this would fall back to the native WooCommerce templates.
Starting in 2.31.0, CheckoutWC can handle the order-pay endpoint. You enable it in WP Admin > CheckoutWC > Pages > Checkout. Look for Order Pay at the bottom of the page:
Once enabled, the order pay page looks like this:
Please note: This premium feature is available to Plus, Pro, and Agency license holders.