A developer needs to write AMPscript to ensure the expiration date on a coupon is...

To ensure the expiration date on a coupon is the last day of the month, the developer should find the first day of the next month and subtract one day (A). This approach guarantees that the expiration date is set to the last day of the current month.

Example AMPscript:

SET @firstDayNextMonth = DateAdd(DatePart(Now(), "MM"), 1, "M") SET @lastDayCurrentMonth = DateAdd(@firstDayNextMonth, -1, "D")