@type t() :: %PolarExpress.Schemas.SubscriptionCanceledMetadata{
  amount: term(),
  cancel_at_period_end: term(),
  canceled_at: term(),
  currency: term(),
  customer_cancellation_comment: term(),
  customer_cancellation_reason: term(),
  ends_at: term(),
  product_id: term(),
  recurring_interval: term(),
  recurring_interval_count: term(),
  subscription_id: term()
}