Sets or returns the amount of the first payment, when the transaction is divided to installments.

Field name: FirstSum.

Credit card payment can be divided into several installments. The AdditionalPaymentSum property represents any additional installments. For the first payment, use the FirstPaymentSum property. The total number of payments is set in the NumOfPayments property, and the total payment amount is set in the CreditSum property.

Applies only if the payment method allows partial payments.

Payments_CreditCards Object