Apple Pay lets users make in-store payments for physical goods or services using an iOS 8 app. Payment information is stored in their iOS device, and users can use Touch ID to provide their payment and shipping information to complete the transaction with a single touch. The SDK is written using Objective-C.
The W3C Web Payments Working Group has published working drafts of Web Payments HTTP Specifications that include the Web Payments HTTP API 1.0 and Web Payments HTTP Messages 1.0. The two specifications are designed to work together to enable payment requests outside of a browser context.