The Stripe Android Sample Code by Stripe presents how to integrate payments. Developers can learn how to collect credit card information from a user. Full documentation is available at https://stripe.com/docs/mobile/android
PayPal has officially released PayPal X, its next generation platform that includes a variety of APIs and other resources for developers. Primarily aimed at allowing developers to embed payment processing in a wider array of applications and environments, this is a major expansion of PayPal's APIs.
Mocapay focuses on mobilizing businesses' payment, loyalty, coupon, and gift programs through innovative software. Mocapay aims to unify merchant programs and payment options across all devices. To enhance its platform, Mocapay recently launched a token solution that integrates with any POS system via an API.