What you need to know
Payment integration affects trust and order accuracy. The store needs to confirm payment state, handle cancellations, and prevent duplicate orders when customers retry.
How to apply it
Check supported regions, currencies, fees, test mode, callback verification, refunds, and settlement. Test successful, declined, pending, and cancelled payments before launch.
Common mistake to avoid
A browser redirect alone does not prove payment. Verify status through the provider's server-side flow and reconcile test orders.