期初付款 meaning in English

initial payment

If payments are due at the end of the payment period , or
如果在付款期初付款，则此参数必须为
And a number that indicates whether the payment is due at the beginning or end of the payment period
) ，以及一个指示是在付款期初付款还是在期末付款的数字
And a number that indicates whether each payment is made at the beginning or end of the payment period
，以及一个指示是在付款期初付款还是在期末付款的数字