pub fn credential_params(
method: AuthMethod,
client_id: &str,
assertion: Option<&str>,
) -> Result<Vec<(&'static str, String)>>Expand description
The client-credential form parameters for a request.
A public client sends only its client_id — attaching an assertion it never
registered is what makes every dev login fail at PAR. A confidential client
that somehow has no assertion is an error rather than a silently
unauthenticated request.