This API provides access to Ellen Gould White writings and advenist pioneer library.
In order to access API you should register your application
Basically, autodiscovery with OpenID Connect Discovery protocol is enabled. If your software understands it, read no further. Autodiscovery URI is https://cpanel.egwwritings.org/
Otherwise, here are oauth2 endpoints:
https://cpanel.egwwritings.org/connect/authorize
https://cpanel.egwwritings.org/connect/token