Paying Premiums on Line


It is great that Hagerty Insurance invoices can be paid on line. Unfortunately it looks like one cannot select the payment date in advance, a real shortcoming in my opinion!
Help me understand why this option cannot be added. That way I can get the bill, go on line and pay it for an efective future date but within the due time frame all in one visit. Would it be that you don’t have this option because it increases cash flow by getting moneys not yet due early?