The network for creativity
Join 1.25M professional creatives like you
Connect with clients, get discovered, and run your business 100% commission-free
Creatives on Contra have earned over $150M and we are just getting started
Back to feedPost
Quick backend tip:
If your payment webhook can fire twice, your code must handle it twice.
Store the event ID, check it before processing, and return 200 fast. That one habit prevents most duplicate-charge and double-credit bugs.
I build payment systems like this for a living (Stripe, Razorpay and more). Need one built or fixed? Message me here.
The network for creativity
Join 1.25M professional creatives like you
Connect with clients, get discovered, and run your business 100% commission-free
Creatives on Contra have earned over $150M and we are just getting started
Related posts
Quick backend tip:
If your payment webhook can fire twice, your code must handle it twice.
Store the event ID, check it before processing, and return 200 fast. That one habit prevents most duplicate-charge and double-credit bugs.
I build payment systems like this for a living (Stripe, Razorpay and more). Need one built or fixed? Message me here.
When I build invoice reconciliation, I start with matches I can explain.
For CrossCheck, I connected supplier invoices, customer invoices, WHMCS records and domain events in one flow. Exact matching runs before fuzzy and context-aware matching. Uncertain items keep their source records and matching context for finance review.
I judge the workflow by how easily finance can trace an exception back to the evidence and resolve it.
https://kapilchauhan.netlify.app/case/openprovider.html
Problem: Barbershop taking bookings on Instagram DM, no-shows 40%, no client history, manual payment tracking.
What I built:
→ Client booking website - pick barber, service, time slot, pay deposit
→ Automatic SMS/WhatsApp reminders to reduce no-shows
→ CRM dashboard - client history, favorite cuts, lifetime spend, retention
→ Admin panel - barber schedules, daily sales, payouts
→ Stripe , secure payments & auto receipt.
Result: Bookings 24/7 without DM, no-shows dropped to 5%, owner sees revenue from phone.
Great work 🔥