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Payment Gateway refers to an e-commerce service that authorizes payments for e-businesses & online retailers. In a way, it represents a physical POS (Point-of-sale) terminal located at most retail outlets. Payment gateways encrypt sensitive information, such as credit card numbers, to ensure that information passes securely between the customer and the merchant.
Many payment gateways also provide tools to automatically screen orders for fraud and calculate tax in real time prior to the authorization request being sent to the processor. Tools to detect fraud include geolocation, velocity pattern analysis, delivery address verification, computer finger printing technology, identity morphing detection, and basic AVS checks.
Some of the popular payment gateways are Paypal, authorize.net, check2out etc.