I can integrate required payment gateway for your game, like Paytm, Razorpay,etc. Along with this, if you want localised payment gateway integration in your Android or iOS Unity game, I can do it for you. I have attached a demo razorpay payment system apk file. Kindly check this out. https://drive.google.com/file/d/1SkW8ds8a9gnLfbwa7Yy_ZNH7buh-g1vd/view?usp=sharing
What the Seller needs to start the work
I will need you to setup the payment gateway details which will allow me to integrate into the game.