Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
Sell My App - Sellmyapp is a top quality mobile source codes marketplace with strong community elements
Wirize - Payment checkout for freelancers
Codester - The marketplace for ready-to-use web development assets
Giftbit Payment API - Stripe for gift cards
CodeCanyon - Scripts and Snippets From $1 for PHP, JavaScript, ASP.NET, CSS, Plugins, HTML5, Mobile and more