OpenID Connect
Hellō, specifically, the Hellō Wallet, is an implementation of OpenID Connect (opens in a new tab), the same identity federation protocol used by Apple, Facebook, Google, and Microsoft.
The section of the documentation describes Hellō implementation of OpenID Connect. Hellō extensions are documented in API Reference | Wallet and the support scope values in Hellō Scopes.
The Hellō OpenID Configuration is at https://issuer.hello.coop/.well-known/openid-configuration (opens in a new tab).
NOTE: The Hellō Issuer is https://issuer.hello.coop
and is NOT https://wallet.hello.coop
. This simplifies a separation of concerns per the Hellō Protocol