Payment Gateway Integrations
Stripe & Moyasar integrations with idempotent webhooks, invoicing and refunds — payment flows engineered to survive edge cases, not just the happy path.
How it happened
"Just add Stripe" is never just that
Clients usually ask for payments as a single checkbox in a bigger scope — until the first refund request, the first failed webhook, or the first customer who got charged twice by accident.
Money can't be 'mostly correct'
Payment integrations fail in ways that are invisible until they cost someone money: a webhook retried twice can double-charge a customer, and a race condition in refund logic can quietly drain trust in the whole platform.
Idempotent by default, tested on purpose
I build every webhook handler to be idempotent from the start — a retried event can never double-charge anyone — and deliberately test the unhappy paths: failed payments, partial refunds, expired sessions, not just the demo-ready happy path.
Payment flows that survive real customers
Every integration I've shipped has run in production without a duplicate-charge incident — the kind of reliability that's invisible when it works, and very visible when it doesn't.
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