@type t() :: %MollieAPI.Model.SubTotals{
  cardAudience: MollieAPI.Model.BalanceCardAudience.t() | nil,
  cardIssuer: MollieAPI.Model.BalanceCardIssuer.t() | nil,
  cardRegion: MollieAPI.Model.BalanceCardRegion.t() | nil,
  count: integer() | nil,
  feeType: MollieAPI.Model.BalanceFeeType.t() | nil,
  method: MollieAPI.Model.PaymentMethod.t() | nil,
  prepaymentPartType: MollieAPI.Model.BalancePrepaymentPartType.t() | nil,
  transactionType: MollieAPI.Model.BalanceTransactionType.t() | nil
}