Credit Card Processing Oklahoma Merchant Service, “Best Merchant Services”, provides tailored payment processing solutions for all businesses in the OK, including debit and credit card processing, end-to-end merchant services, mobile/wireless transaction processing, 24/7 Help Desk, real time reporting, and custom payment services. Our payment services extend throughout Oklahoma County (including Canadian, Tulsa, Cleveland, Canadian, Comanche, and Rogers) for local, small, and big businesses.