Introduction Imagine you're purchasing a product online. You click the "Pay Now" button,...
Introduction
Imagine you're purchasing a product online. You click the "Pay Now" button, and due to a slow internet connection or impatience, you accidentally click it again.
A common question among developers is:
If two requests are sent, why doesn't the payment get processed twice?
The answer lies in a combination of frontend protection, backend safeguards, database design, and payment gateway architecture.
A customer clicks the Pay button, the server sends the request to a payment provider, and the charge...
Idempotency Keys: The API Pattern That Saves You From Duplicate Payments and Phantom...
Idempotency Keys: The Simple Trick That Prevents Duplicate Payments and Ghost...
You hit "Submit Order" and the network drops mid-request. Did the charge go through? Should you...
A payment request goes out. The network hiccups. The client never sees a response, so it does the...
You hit "Pay" and the browser spins. Network timeout. Did the charge go through? You retry — and get...
