Using Payments Cards Online Processing credit cards online payment service provider(PSP a third-party service connecting a merchants EC systems to the appropriate acquirers. PSPs must be registered with the various card associations they support Electronic Commerc Prentice Hall 2006Electronic Commerce Prentice Hall © 2006 7 Using Payments Cards Online • Processing Credit Cards Online payment service provider (PSP) A third-party service connecting a merchant’s EC systems to the appropriate acquirers. PSPs must be registered with the various card associations they support