In order to accept payments on the site, I created a Stripe account and wrote the keys on the settings page. After that, I wanted to check if the payment works. I created a category, selected an ad creation cost and went to the credit purchase page. There, I entered my credit card information and clicked the "Pay" button.
After clicking the button, a 500 error occurred. And all the pages that are related to payment started showing error 500.
Can you tell me what the problem could be and how to solve it. Thank you
After restart service, website is down - error 501