I am working on a no code platform and I am using quickpay checkout API. After this successful transaction I know it redirects to redirectURL provided in the request body of the “online-checkout/payment-links” POST API . But if it fails what does happen and how will I get notification
If the payment fails the customer won’t be redirected. This allows them to re-enter their card information to successfully checkout. You can listen for payment webhook events to identify failed payments for an order associated to the payment link. 
Thankyou for your reply.