Adding a coin/reward system

Hey, Is there any means possible with which participating in tournaments or winning a tournament gives you a reward (eg coins) that will be visible in your profile).
This coins can then be set as a requirement to participate in tournaments (eg this tournament requires a minimum of 30 coins) and also be used as an alternative payment in the website shop. I will really love to know if such system is in place and if not, how can I get to implement such. Thanks