https://wordpress.org/plugins/indieauth/
IndieAuth is a way to allow users to use their own domain to sign into other websites and services.
wordpress pluginindieauthorg
https://indieauth.spec.indieweb.org/
IndieAuth is an identity layer on top of OAuth 2.0 [RFC6749], primarily used to obtain an OAuth 2.0 Bearer Token [RFC6750] for use by [Micropub] clients....
indieauth