SyncDrift: Automated App-Access Reconciliation for Stripe-Powered SaaS

Before you validate, know that the built in retries and failed payment emails already recover a fair share of failed renewals, so the real gap is usually drift between the processor and your own database, not recovery. Two common causes: access gets granted on the checkout success redirect instead of the invoice.paid event, so a first payment that never completes leaves someone active forever, and a webhook endpoint that was down long enough for retries to run out. Fix the first by making paid status the only thing that unlocks access. For the second, a nightly job that lists subscriptions in past\_due, unpaid and incomplete states and compares them to your users table catches whatever the webhooks missed.

since a few people already said "stripe webhooks" i'll skip that and give the validation answer, because it changes what's worth building. stripe already tells you a payment failed, and its smart retries plus dunning emails recover a big chunk on their own, so a tool that just detects a failed payment is mostly redundant. that's the trap to avoid. the unmet gaps are what stripe doesn't close: zombie accounts where the first payment never landed but they still have access, and silent involuntary churn from an expired card at renewal that nobody's watching. and stripe won't reconcile "is this person's actual app access matched to their paying status right now", that drift is where money quietly leaks. so if you're building, don't build "detect failed payment", build the reconciliation and win-back layer on top of the webhook. the thing to validate is whether people lose real money to that access-vs-payment drift, not to not-knowing a payment failed."