@type t() :: %PolarExpress.Resources.Subscriptions{
  amount: integer() | nil,
  cancel_at_period_end: boolean() | nil,
  canceled_at: term() | nil,
  checkout_id: term() | nil,
  created_at: String.t() | nil,
  currency: String.t() | nil,
  current_period_end: term() | nil,
  current_period_start: String.t() | nil,
  custom_field_data: term() | nil,
  customer: map() | nil,
  customer_cancellation_comment: term() | nil,
  customer_cancellation_reason: term() | nil,
  customer_id: String.t() | nil,
  discount: term() | nil,
  discount_id: term() | nil,
  ended_at: term() | nil,
  ends_at: term() | nil,
  id: String.t() | nil,
  metadata: map() | nil,
  meters: [map()] | nil,
  modified_at: term() | nil,
  prices: [term()] | nil,
  product: map() | nil,
  product_id: String.t() | nil,
  recurring_interval: map() | nil,
  recurring_interval_count: integer() | nil,
  seats: term() | nil,
  started_at: term() | nil,
  status: map() | nil,
  trial_end: term() | nil,
  trial_start: term() | nil
}