Link Tinkoff.Credit to the form of payment on the site and set up

Hello!

Task:
There is a form of payment on the site to this form it is necessary to bind Tinkoff.Credit through the API (there are very clear instructions from Tinkoff itself).

Important details:
In the past, such integration has already been, but Tinkoff updated the data added minor changes. In fact, you need to go through and update the finished code.