Begin an SSO login flow
Auth
Begin an SSO login flow
Looks up the SSO provider for the email’s domain, generates PKCE + HMAC-signed state, sets a short-lived mnemom_sso_initiator cookie, and returns the IdP URL for the SPA to window.location.href to.
POST
Begin an SSO login flow
Email-link landing (confirmation / recovery / magic link)IdP callback landing — issues session and redirects to SPA