@type t() :: %HookSniffAPI.Model.NotificationPreferences{
  discord_webhook_url: String.t() | nil,
  email_on_dead_letter: boolean() | nil,
  email_on_failure: boolean() | nil,
  email_on_success: boolean() | nil,
  slack_webhook_url: String.t() | nil,
  webhook_url: String.t() | nil
}