We need a mobile landing page (no need style just needs one button to pay now) after clicked pay button open UPI apps in mobile after success payment or failure payment we need to receive the response in our webpage with transaction id, status, and additional params if we pass in requests like order id, name and all.
No need to integrate any third party services.
I will provide the best work for you I like to do smart work with hard work. You'll be happy that you are appointed me. I assure you of the best quality I give my best each time. I have worked on many payment gateways.