PPRO provides a set of intuitive, powerful, and flexible APIs. All endpoints accept and return JSON payloads and are designed around standard HTTP methods (GET, POST, etc..) for customer interactions. This section covers a few basic concepts on how to use our APIs.

Common API functionality

User Agent Header: With improved security, all API requests should now have the User-Agent header. This value should be the application / client making the call.

API Authentication: All APIs expect a Bearer Token for authentication. The access_token is obtained through the Authentication API.

HTTP Verbs: The APIs are designed to get as close as possible to standard HTTP and REST conventions with the use of HTTP verbs.

Verb	Usage
`GET`	Used to retrieve resources.
`POST`	Used to add a child resource under resources collection, it is a non-idempotent operation also commonly used to retrieve tokens.
`PATCH`	Used to partially update an existing resource, it is a non-idempotent operation.