... compliant. This ensures interoperability with other packages and frameworks. The library uses PHPUnit for unit tests. We use Github Actions, Scrutinizer, and StyleCI for continuous integration. In order to prevent man-in-the-middle attacks, the authorization server MUST require the use of TLS with server authentication as defined by RFC2818 for any request sent to the authorization and token endpoints. The client MUST validate the authorization server’s TLS certificate as defined by RFC6125.