- Payment Gateways
- SMS Gateways
- Email Gateways
- RESTful Services
A payment gateway is a merchant service provided by an e-commerce application service provider that authorizes credit card or direct payments processing for e-businesses.
SMS gateway allows a computer to send or receive Short Message Service or transmissions to or from a telecommunications network.
Email gateway processes the mails in some way, such as archiving it or filtering spam. It then passes the mail to the mail server that delivers the mail to recipients.
Web services that conform to the REST architectural style, called RESTful Web services, provide interoperability between computer systems on the Internet.