SquareTrack this API, best known for its mobile payments hardware and software, has introduced an E-commerce API that allows third party POS systems to integrate with Square's payment processing services. The core benefit of the API is the single view of all payments, regardless of through what system or platform the payment was received. The API can be integrated into websites, whether custom developed or self-hosted.
On the backend, those who integrate with the E-commerce API receive all the benefits of those who use Square's traditional hardware and software. Users gain full access to Square's billing system and subscription APIs. Accordingly, the need to chase down payments or set up a standalone billing systems is unnecessary.
The E-Commerce API greatly expands the realm of Square's potential market. SwiftHero is an early adopter of the API and described using the API as "effortless, which is what everyone is starting to expect." Merchants are charged 2.2% per online transaction (as opposed to teh 1.9% transaction fee associated with in-person payments via Square hardware). Check out the API docs to learn more.