Stablecoin subscriptions: keep renewal status and paid access as separate states

A common mistake in crypto subscription apps is to use one active flag, which turns off access the moment a customer cancels even though they already paid for the period. The article recommends tracking three things separately: whether a payment succeeded, whether another payment is scheduled, and how long access lasts. In its illustrative example, a 30 USDC monthly plan covering November 4 to December 4 is canceled on November 20, so renewal stops but access continues to the end of the paid period. The author stresses representing the effective end of access explicitly, using an exclusive end boundary and clear time zones. The piece also notes that failed charges, duplicate payment events, and refunds each require their own handling rather than being folded into a single renewal flag.