@callback create_signer(binary(), map()) :: map()

@callback generate_claims(
  keyword(),
  binary()
) :: {:ok, map()} | {:error, atom() | keyword()}

@callback peek_claims(binary()) :: {:ok, binary()} | {:error, atom() | keyword()}

@callback peek_header(binary()) :: {:ok, binary()} | {:error, atom() | keyword()}

@callback sign(map(), map()) :: {:ok, binary()} | {:error, binary()}