Integration 1 vs 1 online player in already developed Unity game -- 2

Note:- Please do not bid without reading the project details. I have unity code for a game, i am sharing the apk link below, Please check the game, i want to make it 1 vs 1 online play with friends or random guy, the concept of online playing is like pool game, for example user can connect through fb and can see the list of friends and if any friend is online they can play 1 vs 1, If user wants to play with random player then he/she can play with random player also, user can bet with coins like pool game concept. for betting the coins the amount of coins will be fixed like 50,100,200,500,1000, User can purchase the coins through in app purchase, or by watching rewarded video ads, also user can buy player's dress, shoes and faces by using the coins. Please check the game. and send me the previous work as well. [login to view URL]