OptionaloptionsToken-expiry info for the credential, returned as a flat map: access_token_expiration (always
set) and refresh_token_expiration (set when the credential has a refresh token). Both values
are timestamps.
OptionalprovisioningProvisioning state of the credential. ACTIVE means the caller is logged in and the credential
is usable; any other state means the login has not completed.
A caller's per-user OAuth credential for an MCP service.