Hi,
Regarding redirecting to the payment page:
- Please navigate to WP Dashboard > WooCommerce > Status > Tools > and click Create pages opposite Create default WooCommerce pages.
- Please refresh permalinks; you can check this doc: How to refresh WordPress permalinks - HivePress Help Center
- If this issue exists, please disable third-party plugins and customizations (if there are any) and check if this issue persists. If you use a caching plugin, ensure that caching is disabled for logged-in users.
I believe this will be useful to you.