This is the official Payeezy iOS SDK to integrate payments, credit cards, and e-commerce solutions into Apple Pay. A PDF guide in GitHub published by Atul, the same writer of the SDK, demonstrates how to install, create payment tokens, and integrate with Apple Pay. Guide available at https://github.com/payeezy/payeezy_ios/blob/master/guide/payeezy_iOS_SDK042015.pdf
Shopping isn't necessarily particular for this audience, but have you ever tried to help your parents or non tech-savvy friends try to shop for a computer? SalesClark aims to combine several online shop APIs (such as Amazon and Commission Junction) to build a tool that you can sit your mom down with and help her find a computer.
The LightSpeed API allows developers to build on LightSpeed's retail platform, one designed to mimic the experience of walking into an Apple bricks and mortar store. The platform also helps stores sell online. Developers can add loyalty programs, integration with enterprise-resource-planning systems, and build mobile sales dashboards. More information is available through its LDX, the LightSpeed Developer Exchange, that opens up the program and website.