I’m a backend engineer who repairs broken payment integrations — Stripe, PayPal, Adyen, FPX and more. Silent webhook failures, double charges, stuck refunds: I find the root cause, not a patch. Fixed fee. You keep 100% of the code.
Provider fires the webhook, your endpoint fails signature verification or crashes — orders stay “unpaid” and support tickets pile up.
Retries re-submit the same payment, or a double-click fires two requests. Refunds become a daily ritual.
Test/live keys, webhook URLs and event types mismatched. You only discover it after real money flows.
Refund succeeds at the provider, but your status sync is broken — customers email you, money already left the account.
Failed payment retries (dunning) misconfigured, SCA/3DS flows broken, or invoices are created twice.
Payment providers only log their side. The gap between their logs and yours is where revenue quietly dies.
Every engagement starts with a root-cause diagnosis. I don’t guess — I read the logs, replay the events, and trace the code path that actually runs.
Signature verification, retries, event replay, dead-letter queues, event-type coverage. Make the provider’s events actually drive your business logic.
Idempotency keys, atomic payment state machines, race-condition fixes so one order can never be charged twice.
One-time payments, recurring billing, invoices, SCA/3DS handling, dunning and failed-payment recovery.
Move from PayPal to Stripe, legacy to modern providers, or consolidating multiple gateways — without double-charging or losing customers.
Refund/status sync, dispute automation, evidence submission so chargebacks stop being silent losses.
PCI-DSS scoping, tokenization done right, sensitive-data hygiene in logs. The boring stuff that keeps you out of trouble.
You get a quote before any fix work starts. Diagnosis credit applies to the Fix, so you never pay twice for the same problem.
Payment: card via secure payment link (Visa/Mastercard, FPX, DuitNow) or bank transfer — instructions are on your invoice. Prices in USD; invoiced in USD or MYR.
Share symptoms, error logs, and your stack via the form or a short call. No prep required.
A root-cause report in plain language plus code-level detail, and an exact fixed-fee quote for the fix.
Changes implemented with tests, so you review a clean diff. You own everything. NDA available.
Handover notes for your team, 30 days of follow-up free. Upgrade to Flow Care if you want it monitored.
No account managers, no ticket roulette. One engineer owns your problem end to end.
Stripe and PayPal, but also FPX, GrabPay, Touch ’n Go, Xendit, Midtrans, Razorpay — the gateways most Western contractors have never touched.
No lock-in, no proprietary platform. Fixes land in your repository, in your stack: Laravel, Node, Python, Go, Rails, .NET.
If the diagnosis is wrong or I can’t fix it, you don’t pay for the fix. The report is yours either way.
Based in Malaysia (MYT). Morning overlap with Europe, evening overlap with the US — fast turnaround for both.
NDA signed before access, read-only scope first, sandboxed test data encouraged. Your secrets stay yours.
Prefer email or a call? Either works. Attach logs, your provider dashboard screenshots, or a loom — the more context, the faster the diagnosis.
✉ contact@payflowfix.dev 🕑 Mon–Sat, ~09:00–22:00 UTC+8 (MYT) ⚡ Diagnosis: $99 · credited toward your fixNDA available on request. Read-only access first, sandboxed test data encouraged.