It is a service delivered by a company approved by card associations (Visa, AMEX, Mastercard etc.). It supplies authorization and settlement services that allows transactions to be done on the internet. When a customer sends their card details to pay for a good or a service, those confidential details are not passed to your business. The payment gateway will check that the payment is fully compliant to Europeans regulations and not sourced from a stolen card. The approved payment request is then pushed into the Banking system. The online business has been paid and the client’s card has been debited in matter of seconds.