A third party that is designated by a merchantA business selling goods or services either in person (retailer) or remotely (website or mail order/telephone order) often accepting payment cards as a form of payment. to handle credit cardA plastic or virtual card with a credit limit used to purchase goods and services and to obtain cash advances on credit for which a cardholder is subsequently billed by... and debit cardA debit card is a payment card that’s linked to a bank account. This debit card allows the account holder to make purchases and withdraw funds when needed. Debit cards... transactions between that merchantA merchant is an individual or a business that sells goods or services to customers. Merchants are able to accept payments through multiple means, including cash, credit/debit cards, digital wallets... and its customers. They are often broken down into two types: front-end processors and back-end processors.