API is accepting payments from credit cards?

It is necessary to look in the direction of check your company and open a merchant account, or in any way as far as I know. Including a merchant account can be opened in Russian Bank.
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Can refer to the "famous" not so long ago the company ChronoPay ) www.chronopay.com/ru/reference/Small-Medium-Business.FAQ.Work-Questions

OOO under the project is planned, of course. Thanks for the link. What will chronopia wrong?

At the initial stage the majority of the payments expected from Russia in rubles, so look to a local Bank. Later it is planned and PayPal, and probably accounts in foreign banks.

engine.paymentgate.ru/
seems like 2 options... from the pages of the Bank payment and from your page...
\rengine.paymentgate.ru/bpcservlet/BPC/documents/pravila_podklucheniya.htm

If you want the Bank, then look in the direction the API is used by many "aggregators". Writing as someone who did a similar system. Also heard about Ocean Bank, but do not vouch for them. If you want a foreign decision, that is, there is a service from Amazon (only for States) and Plimus. Good luck in your endeavors!