From YITH > Auctions > General > Verify payment method of bidders, you can enable the integration between the two plugins.
- Verify payment method: Client must have a credit card added to his account, in order to place bids. If the user did not link a credit card to his account, he cannot bid.
The plugins shows a notification on the product page.
For more information on how to set up the YITH Stripe plugin, check this page here.