@type t() :: %PolarExpress.Schemas.WebTokenRequest{
  client_id: String.t() | nil,
  client_secret: String.t() | nil,
  grant_type: String.t() | nil,
  scope: String.t() | nil,
  session_token: String.t() | nil,
  sub: String.t() | nil,
  sub_type: String.t() | nil
}