CMS Bitrix - site improvements

You need to solve the problem with online payment on two sites. Stopped working. I will tell all the details in the LOC to the candidates.
There is also a task of improvements.
Potentially, I am looking for a performer for permanent tasks and work in a professional team for the development of sites and web applications.
Im waiting for feedback!

P.s I put the budget random, do not pay attention to it