Postman - The Collaboration Platform for API Development
PayJunction - PayJunction powers mid- to large-scale businesses with smart payment processing, electronic signature capturing, and comprehensive multi-user multi-location reporting.
Cdyne - Cdyne is a professional REST and SOAP API provider.
Merchant Warrior - Merchant Warrior is an end-to-end payments gateway that provides merchant services via an online payment gateway, ISO management, and payment solution providing platform.
LinkedIn - LinkedIn is a business-oriented social networking service, mainly used for professional networking.
Vapulus - Vapulus is an ultimate Payment solution for businesses that meet their specific needs.