Hi,
Indeed there is a plugin “Ultimate Auction” which allows to make the auction on the page https://reflexengages.fr/boutique/
They are much less reactive than you and actually I don’t know which setting is important to use with your theme to improve the user experience. It adds a priori, these fields for a payment by stripe
As I do not speak English very well, do not hesitate to ask me for access. Maybe we would save time.
Thanks for your help