According to the contract, the principal must be paid along with the linkage on the payment date specified on the payment schedule page of the contract. If the payment is not paid along with the index, the payment accrual of the system first covers the interest (if any), then the index and finally the principal. Therefore it is important to know that if you do not pay the principal with the index and interest (if any) the card will continue to accumulate indices and interest (if there is a delay in payment).