Function get_backend_certificates 

fn get_backend_certificates(
    key_setup: SigningKeySetup,
    signing_key_id: impl Display,
    signers: &[impl RawSigningKey],
    backend_id: BackendType,
) -> Result<Vec<Certificate>, Error>

Retrieves the certificate of a single signing key from a backend.

Errors

Returns an error if the certificate retrieval from the backend fails.