t() :: %AdyenCheckoutEx.Model.ResponseAdditionalDataInstallments{
  "installmentPaymentData.installmentType": String.t() | nil,
  "installmentPaymentData.option[itemNr].annualPercentageRate":
    String.t() | nil,
  "installmentPaymentData.option[itemNr].firstInstallmentAmount":
    String.t() | nil,
  "installmentPaymentData.option[itemNr].installmentFee": String.t() | nil,
  "installmentPaymentData.option[itemNr].interestRate": String.t() | nil,
  "installmentPaymentData.option[itemNr].maximumNumberOfInstallments":
    String.t() | nil,
  "installmentPaymentData.option[itemNr].minimumNumberOfInstallments":
    String.t() | nil,
  "installmentPaymentData.option[itemNr].numberOfInstallments":
    String.t() | nil,
  "installmentPaymentData.option[itemNr].subsequentInstallmentAmount":
    String.t() | nil,
  "installmentPaymentData.option[itemNr].totalAmountDue": String.t() | nil,
  "installmentPaymentData.paymentOptions": String.t() | nil,
  "installments.value": String.t() | nil
}