EngineeringPayments2 min read
Idempotency is not optional in payments
A double-tap should never become a double-charge. How Collect makes payment endpoints safe to retry — by design, not by luck.
Paul Smith · May 12, 2026
Founder
Works on the payments and collections engine — idempotency, webhooks, and the parts that must never lose a cent.
A double-tap should never become a double-charge. How Collect makes payment endpoints safe to retry — by design, not by luck.