Connect acquiring Sber to the site

Good afternoon, there is a site on PHP MySQL, with commerce, you need to connect acquiring Sber.

With the engine, I will help you, there is already ready strapping, it remains only interaction on the api to give goods there and get data on payment from equating.

Write your suggestions on terms/cost. Ideally, if you have experience with the Sber API or know how to do it.