The Khipu PHP SDK by Khipu allows developers to integrate the Khipu API into their PHP applications. Basic usage examples are included in the documentation.
Optimal Payments, a leading online and mobile payment processing services provider, has announced the launch of a Developer Center and a suite of REST-based APIs.
Square today announced the Square Reader SDK, a toolkit that will let Android and iOS developers design and deploy their own checkout experience for both sellers and buyers. The SDK makes it possible to run a custom UX on Square's hardware, opening up new possibilites for retail.
