Thank-you-page gets the error: 502 (Bad Gateway)

I test payment function with my website, in the end I get the error. Please see the attachments for details. Anybody can help me to fix this issue ?

What payment process are you using? If you are using Wix Pay , did you follow the configuration process?

I use the Stripe for credit/debit card, do you have any suggesion for me ?

Hello,
Anyone can help me ?

Hi,
Please share your code so we can inspect.