Subscriptions that handle
a declined card without losing the customer
The part of subscription commerce that actually determines revenue is not the checkout, it is what happens when a card fails to renew. A platform without a proper dunning flow loses a meaningful share of subscribers to expired cards and bank declines that a simple retry and a well-timed email would have recovered.
What it is and who needs it
A subscription commerce platform fits a business selling on a recurring basis, a subscription box, a membership, a recurring service, where the hard problem is not the first sale but keeping the subscriber paying month after month. It fits a business currently handling failed payments manually or losing subscribers silently to expired cards. It does not fit a one-time-purchase store, where recurring billing infrastructure is unnecessary complexity.
What is inside
Recurring billing with proration handled correctly when a subscriber upgrades or downgrades mid-cycle, so they are charged or credited the right amount instead of a flat new price. A dunning sequence that retries a failed charge on a sensible schedule, prompts the subscriber to update their card before giving up, and only cancels after those attempts are exhausted. Self-service pause, skip and cancel flows, since a subscriber forced to email support to pause often cancels outright instead. An admin dashboard showing the metrics that actually matter: active subscribers, churn, and how many failed payments the dunning sequence is recovering.
How we build it
We start with the plan structure and billing rules, since proration, trial periods and plan-change logic need to be decided before the billing code is written, not patched in after the first upgrade request breaks something. The dunning sequence is built and tested against real failure scenarios, a card that is simply expired versus one that is actually being declined for fraud review, since treating every failure the same wastes retries on cases that will never succeed. The subscriber portal is built so changing a plan or updating a card takes a subscriber under a minute, since friction here is exactly where subscribers give up and cancel instead.
What to watch
Proration is the single most bug-prone part of subscription billing, and a mistake here either overcharges a customer, who notices and complains, or undercharges silently, which nobody notices until a revenue audit months later; we test every upgrade, downgrade and mid-cycle plan change against real scenarios before launch, not just the simple case of a subscriber who never changes plans. The dunning sequence carries its own risk: too aggressive and it reads as spam, pressuring a customer who genuinely cannot pay right now and pushing them to cancel out of irritation; too passive and a recoverable failed payment quietly becomes a lost subscriber. We tune the sequence’s timing and tone to the specific product rather than using one aggressive default for every subscription type. The third trap is webhook reliability: a payment provider’s webhook that fails to deliver or arrives out of order can leave a subscriber’s status out of sync with what they actually paid, so we build idempotent webhook handling that tolerates retries and out-of-order delivery rather than assuming every webhook arrives exactly once, in order, on time.
Timeline and price
| Option | Price | What it covers |
|---|---|---|
| MVP | from $7,000 | Single plan tier, basic retry on failed payment, manual cancellation |
| Production | from $12,000 | Multiple plan tiers with proration, full dunning sequence, subscriber self-service portal, admin dashboard |
| Full control (handover-ready) | from $20,400 | Everything in Production plus usage-based billing support, architecture documentation, and 90 days of support |
Running cost after launch depends on hosting and, where relevant, model usage, typically $20 to $150 a month for a project at this scale.
What you own at the end
You own the subscription platform’s code and database, with billing synced to your own payment provider account under your name. Subscriber data, plan history and payment status are yours to export or migrate at any point, with no proprietary lock-in to keep the business running. This is the same handover standard on every store or marketplace we build: the platform account, every payment and delivery credential, and the full order history stay in your name from the first day, not just after a dispute. A written handover document explains what each integration does and why, so a future developer, ours or someone else’s, can pick up the system without reverse-engineering it from the code alone.
Related
See the development service page for our full build process. This pairs with SaaS billing and tenant system, Digital goods marketplace. For the engineering detail, see Subscription billing with dunning, Subscription box commerce. For a real build, see ProBay: our own marketplace, D2C store Thailand audit and rebuild.
Want this built for your business? Get in touch and we will scope it with a fixed price.
FAQ
How much does a subscription commerce platform cost?
From $7,000 for a platform with recurring billing, dunning and a subscriber portal, 6 to 10 weeks. A platform with multiple plan tiers, proration logic and usage-based billing runs $12,000 to $18,000.
What is dunning and why does it matter?
Dunning is the sequence that runs when a renewal payment fails: retrying the charge on a schedule, prompting the subscriber to update their card, and only cancelling after those attempts are exhausted. Without it, a subscriber with an expired card simply disappears instead of being given a chance to stay.
What is the stack?
FastAPI or Node on the backend depending on your existing systems, integrated with your payment provider's subscription and webhook APIs (Stripe or a regional equivalent), with a subscriber-facing portal in Next.js.
Can subscribers pause instead of cancelling?
Yes, a pause and resume flow is built in by default, since a subscriber who can pause for a month is a subscriber who often comes back, where one forced to fully cancel often does not.
Who owns the subscriber and billing data?
You. Subscriber records, plan history and payment status live in your own database, synced with your payment provider's systems but never locked inside a tool only we control.