Stripe Checkout, Billing, and Connect implementations with webhook reliability, tax, and reconciliation your finance team can audit.
Stripe as payments infrastructure — not just a checkout button
Stripe covers one-time payments, subscriptions, invoicing, tax (Stripe Tax), and Connect marketplaces. We scope the smallest surface that meets PCI and finance requirements — often Payment Element or Checkout before custom Elements.
Wrong mode (test keys in prod, live webhooks pointing to staging) causes silent revenue loss — we enforce environment separation in CI and secrets managers.
Checkout vs Payment Element vs custom flow
Stripe Checkout is fastest for MVP and low PCI scope — hosted page, Apple Pay, and tax hooks included. Payment Element suits embedded UX in Next.js with design system control.
Custom legacy card forms are discouraged unless you already carry SAQ-D burden — we document PCI implications before build.
Webhooks, idempotency, and exactly-once side effects
Fulfillment (license keys, ERP orders, Klaviyo events) must run exactly once per `payment_intent.succeeded`. We store Stripe event IDs, use idempotency keys on API mutations, and queue retries with dead-letter alerts.
Webhook signing secrets rotate without downtime using overlapping endpoint secrets — documented in the runbook.
Subscriptions, Billing Portal, and dunning
Stripe Billing handles plan changes, proration, trials, and customer portal self-service. Dunning emails and smart retries reduce involuntary churn — configured with your brand templates where Stripe allows.
Metered usage and seat-based pricing get testing matrices so finance signs off on invoice previews before launch.
Connect, marketplaces, and payout compliance
Connect Express/Custom accounts for marketplaces require KYC flows, application fees, and payout schedules per country. We implement onboarding UI and dashboard deep links aligned to your legal entity structure.
Tax and invoicing rules for multi-sided platforms are flagged for counsel — we implement technical collection, not legal classification.
Reconciliation, reporting, and go-live checklist
Sigma or Data Pipeline exports feed your warehouse; until then, balance transaction reports reconcile Stripe to Xero/QuickBooks with documented fee and refund mapping.
Indicative engagements from €4,500 for Checkout + webhooks + Customer Portal; Connect marketplaces are quoted after country and payout matrix inventory.