Payments & Finance Automation
Billing is where products quietly lose money: failed renewals nobody chases, usage nobody meters, refunds nobody reconciles. wwwdot.dev builds payment flows that account for the unhappy paths, because that is where the revenue leaks.
What we build
- Stripe, Razorpay and PayPal integration
- Subscription and recurring billing
- Usage-based and metered pricing
- Pay-per-use credit wallets
- Fiat-to-crypto payment flows
- Micro-payment handling
- Invoicing and reconciliation
How we work
Idempotency is not optional
Payment endpoints are built idempotent from the start. Network retries, duplicate webhooks and double-clicks are normal traffic, and a billing system that double-charges once loses more trust than it earns in a year.
Webhooks as the source of truth
Payment state is driven by verified provider webhooks rather than client callbacks, which can be lost, replayed or forged. Reconciliation runs against the provider so the ledger cannot silently drift.
Failure paths built first
Declined cards, expired methods, partial refunds, chargebacks and mid-cycle plan changes are designed at the outset. They are the majority of real billing traffic and the usual source of unbilled revenue.
Payments & Finance Automation questions
- Which payment providers do you integrate?
- Stripe, Razorpay and PayPal for card and local rails, plus on-chain settlement where crypto payment is required. Provider choice follows your market and currency needs rather than a default.
- Can you build usage-based billing?
- Yes. Metered usage, credit wallets and pay-per-use pricing are all supported, including per-customer cost tracking so pricing can be set against real unit economics rather than estimates.
- How do you prevent double charging?
- Payment endpoints are idempotent and state is driven by verified provider webhooks rather than client callbacks. Reconciliation runs against the provider so the internal ledger cannot drift unnoticed.
Related services
Tell us what you are trying to ship.
We reply within one business day, usually with questions and a rough scope.