Provide my customized website with working payment integration gateways

Hello, I would like to introduce to you a project regarding working payment gateways for one of my current, online businesses. The setup and web/coding configuration of the website is a bit tricky and the documentation is a bit lengthy, whereas we are struggling most with the integration of payments, especially with credit and debit cards for now. We are looking for somebody who can make sure that the whole integration with the multiple payment gateways work well and that the payments work with different payment methods chose by the Clients, especially somebody who knows CIS countries and the configurations of systems there (Russia, Ukraine etc.). Every person who is knowledgeable and experienced in web development/coding and knows something about this is very much welcome to bid!