Clover is a one-tap payment app for mobile purchases. It offers two layers of security by locking the account to a phone number/mobile device and requiring PIN authentication. The user enters payment and shipping information just once, then can make mobile purchases with a click on the Clover icon.
The Clover REST API is available for merchants to list, accept, reject and refund orders using RESTful calls.
Google has released a Google Card Linked Offers API that allows merchants to drive customer loyalty by providing targeted offers to customers who save their loyalty card to Android Pay. Card Linked Offers are displayed to customers within the loyalty card view of Save to Android Pay.
This Square API provides a way to use OAuth to securely manage permissions and access to Square merchant accounts. Square enables developers to build customized solutions that accept payments online...