An interchange fee or simply an interchange is an assessment set by a credit card association and paid to member banks. This interchange that is charged to credit card processors is then passed on to merchants and is the largest portion of what is called the discount fee or the credit card processing fee.
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?