Payment Aggregator & a Payment Gateway A Payment Gateway as the name suggest implies, a pass-through mechanism by which all the credit & debit card transactions are rooted, whereas a Payment Aggregators means the inclusion of multiples of Gateways so that it covers wider perspective when it comes to a payment mechanism.A Payment Gateway & an Aggregator are not mutually exclusive, both are inclusive by nature. A payment Aggregator covers a payment gateway in its ambit whereas it’s not necessary that an aggregators act as a specific gateway.A Payment Gateway will allow the merchants to deal in a specific payment option put on the portal, whereas Payment Aggregators allows you to have, multitudes of options for payment & leaves no stone unturned in fetching payment from the customer towards the vendor.A Gateway acts as an intermediary between merchant & customer who is willing to pay for the services availed or the goods purchased whilst a Payment Aggregator is the interface through which the payments are being accepted & moved further for settlement & clearance.A Payment Gateway generally avails the service provided by Payment Aggregators as small online web stores can’t afford to get the highly secured transaction service fee.A Payment Gateway is owned by Payment Aggregators who are financial institutions which acts as a processing unit for effecting online card payments. In General parlance merchants or vendors are Gateways but they can’t act as Payment Aggregators as it involves a huge amount of investment & capital adequacy.Examples of Payment Gateways: In India, only Banks take up the responsibility to act as Gateways such as HDFC, AXIS, UBI etc. whereas Examples of Payment of Gateway aggregators are PayU, CCAvenue, Bill desk, etc.A payment Gateway needs to get authorization from RBI before getting started, whereas an Aggregator needs necessary certification by Payment Card Industry – Data Security Standard (PCI DSS). Also, Read What is Payment Aggregator?.