Make edits to your WordPress site

Good afternoon!

There is a site on WordPress - https://biotropika.ru/ You need to finish a number of works on it, namely:

1. Add a ready-made piece of code to the existing payment system on the site and check that all orders pass correctly.

2. Fix bugs on the list — https://docs.google.com/spreadsheets/d/1v4ebHcDdYFkoMbH6dC1bZYlY3vzRzbcmMsu403Ri_bI/edit?usp=sharing

Please immediately name the estimated cost and timing in the response. If you cannot help with the payment, but are ready to fix ALL the bugs from the table - write, we also consider this option.