Payments, Invoicing & Licensing

Most of the work falls into two halves. On the payments side: Stripe Checkout and Billing Portal integrations, ACH flows for B2B invoicing, webhook handling that survives retries and replays without double-charging, automated invoice generation with custom branding, reminder email sequences, and a revenue dashboard that shows MRR, churn, and cash-vs-booked without requiring a Stripe dashboard login.

On the licensing side: full license servers for SaaS and installed software. JWT-based license keys that validate offline for short windows but phone home regularly, usage tracking (API calls, active users, seats consumed), expiry and renewal enforcement, and a customer portal where admins can assign seats to their team without opening a support ticket.

We've shipped both pieces live. The patterns here are well-worn — the trick is getting the edge cases right. Failed payments, partial refunds, mid-cycle plan changes, and the customer who swaps their card at midnight are where most integrations quietly break.

Stripe's docs are good. Real business problems are messy. You have annual contracts billed monthly, partial refunds that need to hit the right invoice, a Connect marketplace where payouts have to reconcile to QuickBooks, or a subscription that needs to upgrade mid-cycle without double-charging. The Stripe Dashboard does maybe 60% of what you need. The other 40% is custom code — and that is what Stripe integration consulting actually means. We build the missing 40%.

Engagements we run: subscription billing with tiered plans, usage-based pricing, mid-cycle upgrades, and dunning. Invoicing systems with branded invoices, partial payments, and customer portals. Stripe Connect marketplaces with onboarding, payouts, platform fees, and 1099 reporting. Webhook and event processing that is idempotent, queued, with retry and audit logs. QuickBooks sync where invoices, payments, and refunds reconcile automatically. And hybrid recurring + one-off setups where SaaS plus services plus add-ons live in one customer record.

Reference build: Bridgepointe Painting — a custom Stripe + QuickBooks Online integration we shipped that closed their month-end from three days to thirty minutes. Line-item accuracy, retainer accounting, and per-job profitability reporting end-to-end. Stripe consulting clients served from Macon, Atlanta, and Savannah, GA.

You shipped a product. Now you need to control who can use it, how long, on which devices, with which features. Off-the-shelf licensing SaaS charges per activation, leaks data on your customers to a third party, and breaks the moment your model gets even mildly unusual — trial-to-paid, per-seat-with-floats, offline-OK-for-30-days, named-user-with-machine-pinning. A custom license server gives you back control of activation, entitlements, and revenue protection, and lets you keep customer data on your own infrastructure.

What we build: cryptographically signed license keys (Ed25519 or RS256), machine-bound, time-bound, and feature-flagged. Online activation via REST API with webhooks and an audit trail. Offline activation via signed token files for air-gapped customers. Floating / concurrent licensing with check-in / check-out, lease expiry, and heartbeat. Entitlement management with feature flags per customer, per plan, and per seat. A customer portal for self-serve activation, deactivation, and seat reallocation. And Stripe-tied entitlement so subscription state drives license state automatically.

Threat model first. A $9 mobile app and a $40k enterprise install do not need the same enforcement. We design the abuse-prevention layer (machine fingerprinting, activation count caps, audit-based throttling) to match the realistic threat level for your business. Crypto is standard — signed JWTs, Ed25519, or NaCl — not homegrown.

SaaS founders at the point where billing is about to become a real department, software vendors shipping paid desktop or server software who need license enforcement, B2B service companies that currently send PDF invoices from email, and any product team whose customer support inbox is 40% "I got billed wrong" tickets.

Also: teams that have been using a third-party licensing tool (Gumroad, Paddle, LemonSqueezy) and want to bring the billing logic in-house for better control, margin, and customer experience.

Step one is mapping every state a paying customer can be in. Trialing, active, past-due, cancelled-but-not-yet-expired, refunded, disputed. You'd be surprised how many SaaS apps have "cancelled" and "paused" wired to the same database field with no way to tell them apart later. We clean that up first.

Webhook handling gets extra attention. Every Stripe event goes into a queue with idempotency keys, so a replay from Stripe's end never creates a duplicate row. Webhook failures get retried with exponential backoff, and a Slack alert fires if anything has been failing for more than a few minutes.

License-side builds use short-lived JWTs signed by a private key you own. The client validates offline for the TTL window, then renews. If a seat is revoked, the next renewal fails — no need for a permanent connection, but revocation propagates within minutes.