@type t() :: %Lti_1p3.Tool.Registration{
  auth_login_url: String.t(),
  auth_server: String.t(),
  auth_token_url: String.t(),
  client_id: String.t(),
  id: integer(),
  issuer: String.t(),
  key_set_url: String.t(),
  tool_jwk_id: integer()
}