Offering online sellers the ability to accept electronic payments, a PSP opens a world of payment options to Internet retailers, including credit card acceptance, ACH and direct debit for real-time processing. A PSP can usually connect with many different acquiring banks, card systems and payment networks, meaning that the merchant does not have to establish these connections directly.
PSP (Payment Service Provider)
UniPay Gateway: Open Source Payment Gateway
How to Choose the Best Payment Solution
How to Own a Payment Gateway
What is a Payment Gateway
What is Recurring Billing?
How Payments Work
What Should an Ideal Payment Platform for Investors Look Like?