82ad790e_and_Merchant_Services_Glossary__Definition
[Term] Gateway [Definition] 
In payment processing, any network that connects merchant POS terminals with transaction processing and settlement networks, such as the MasterCard and Visa settlement networks. Gateways can also provide related services, including transaction management and reporting. Gateways more commonly refer to an Internet Gateway, such as Authorize.Net, which allow merchants to set up shopping carts or accept transactions when the card is not present.
Credit Card Processing and Merchant Services Glossary
Definition