[Resolved] Order-received. Customers always go to primary language with Mollie and Pay

Problem:
The client's customers are redirected to the order-received endpoint in the primary language after completing an order, despite the rest of the order process working correctly in the respective languages. This issue persists with payment providers Mollie and Pay.nl and occurs on a multi-domain setup.

Solution:

* Update WCML to the latest version, as the issue should be resolved in WCML v5.3.2.

If the issue persists even with the WCML v5.3.2, please follow the steps below to further troubleshoot the issue:

1. Ensure all endpoints are correctly translated in WooCommerce -> WooCommerce Multilingual -> Store URLs and complete all tasks listed in WooCommerce -> WooCommerce Multilingual -> Status.
2. Test for plugin conflicts by:

- Switching to a default WordPress theme

- Deactivating all non-essential plugins, leaving only WPML, WCML, and necessary plugins to reproduce the issue active

- Ensuring a full backup is made before testing

3. Check the WooCommerce default checkout page setup and look for JavaScript errors in the browser console or related logs in WooCommerce -> Status -> Logs.
4. As a temporary workaround, replace the "Classic Checkout" block or Shortcode with the default Checkout block on the checkout page. A guide can be found in this video: https://tinyurl.com/ynkg55k8.

If this solution does not seem relevant to your situation, please open a new support ticket at WPML support forum.