If you were to create an API for payment gateways we would be willing to get certified. Thus allowing us to create integration with any number of payment gateways. As I mentioned in a previous string our company needs integration with Payeezy which is a product from PNC bank.
It is clear from the multiple requests for Payeezy and untold other gateways that it is a necessary implementation that is required. We look forward to being able to help your team solve this issue for your clients.