If you have ESP (Easy shop platinum) or any other platinum debit card, or even Millennia, then don't set it on AutoPay.
I have set mine to AutoPay only for minimum due amount. But I have always paid through Amazon Pay and it is settled (almost) instantly.
The amount if not paid externally already, will be debited on the due date.
You will be penalized if you don't have sufficient funds on that day.