Most Indian websites have a UPI checkout flow which asks users to complete the payment by opening their UPI app, and then approve the payment. Amazon shows this screen for UPI checkout.
Improve this screen to reduce cognitive load for the user, while also more clearly communicating the ask (what the user needs to do). Also try and simplify the colors and copy used on this page
Note: You need to design only 1 screen of the mobile site. Please do not use any annotations or explanations in your designs