The software has to follow state rules. Some states say you have to print a paper, sign it and keep it. Some say print a voucher, each state has their unique circumstances. While MO may choose to participate in the banking system, they might prefer it mailed or they may be thinking of a potential crash. I could not begin to guess why some of these rules exist.
MO should withdraw the money. You are right to give them plenty of time. If something odd happens and the money is not pulled from your account by the due date, pay them.
@B1TaxedToMuch
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