the payment processor used to handle transactions on your Online retail, the process of selling products online and on mobile through shops, 3rd party marketplaces like Amazon and Ebay, and other channels. store, your payment Also commonly referred to as the "payment gateway," this is the platform that processes payments for online purchases. This term also applies to regular brick and mortar stores that process credit card payments. The gateway processes the transfer of data from the user's bank to the website for the transaction to occur. can be either on-site or off-site, depending on what works best for your model.