Bank offers on Payment Links can be integrated with minimal effort at merchant side. Merchant will have to just pass an object in Create Links API. Majority of the experience w.r.t payment page and offer validation would be managed at Paytm end. Merchant can show the offer details (discount / cashback) against a payment instrument to its end users (as shown in demo below) before the users clicks on the pay button and the transaction gets processed at our end. Here, merchant and Paytm both will modify the order once offer is successfully applied to any transaction for reconciliation purpose.