[keycloak-user] Verifying a password

[Hylton Peimer]

My mobile app is connected to the server using bearer-only tokens. The
tokens were obtained using username/password.

A particular screen in the app requires the user to re-enter the password,
so that the password can be verified at the server-side.

Is there an elegant REST or Java API to perform a simple password
verification, besides a call to /protocol/openid-connect/token endpoint,
which brings all the tokens?