What's the difference between Request Network and Request Finance?

Request Network is a decentralized protocol for creating payment requests. It is maintained by the Request Network Foundation. Request Finance is a commercial application that interacts with the Request Network protocol. It is a product of the Request Labs company. The Request Finance API is the backend of the Request Finance application. It is an abstraction over the Request Network protocol for easy but centralized access. It's the fastest way to integrate Request into your product.

Where can I find the Request Finance API?