Add real money payment gateway to Unity game for user to pay and withdraw money - 30/04/2018 23:14 EDT

I have a unity multiplayer game based on photon plugin. the game currently uses google IAP for buying virtual coins to play the game. need to replace this with real money system. where user pays real money to play and winner can send withdrawal request of money to admin. there needs to be a admin panel created to see withdrawal requests and approve them by click of a button to process the payment.