@type t() :: %Polarex.CheckoutConfirmStripe{
  allow_trial: false | nil,
  amount: integer() | nil,
  confirmation_token_id: String.t() | nil,
  custom_field_data: map() | nil,
  customer_billing_address: Polarex.AddressInput.t() | nil,
  customer_billing_name: String.t() | nil,
  customer_email: String.t() | nil,
  customer_name: String.t() | nil,
  customer_tax_id: String.t() | nil,
  discount_code: String.t() | nil,
  is_business_customer: boolean() | nil,
  locale: String.t() | nil,
  product_id: String.t() | nil,
  product_price_id: String.t() | nil,
  seats: integer() | nil
}