How to monitor the availability of the Internet acquiring form from Sberbank?

Question

Payment systems

The site has a form of repayment with cards, i.money, etc. from the savings bank.
Tell me how to monitor errors, the possibility of payment, etc., a link to the documentation, etc.
It’s just that sometimes Sberbank gives 200 OK, but there is no form on the site, they don’t load it, you need to set up monitoring and notification of a non-working acquiring service.
Provide links to similar cases.