@type t() :: %StripeElixir.Params.Checkout.SessionCreateParams.SubscriptionData{
  application_fee_percent: float() | nil,
  billing_cycle_anchor: integer() | nil,
  billing_mode: map() | nil,
  default_tax_rates: [String.t()] | nil,
  description: String.t() | nil,
  invoice_settings: map() | nil,
  metadata: map() | nil,
  on_behalf_of: String.t() | nil,
  proration_behavior: String.t() | nil,
  transfer_data: map() | nil,
  trial_end: integer() | nil,
  trial_period_days: integer() | nil,
  trial_settings: map() | nil
}