Counter strike tournament website / client

Hello, I want a website that is going to be used as a platform for a video game tournament i want to host. The game is counter-strike:global offensive. There are a few popular websites such as [login to view URL] as well as [login to view URL] I want the website to be able to have a few functions such as connect/link with the players STEAM account through either the website or a client so that when they join my server they are verified and allowed to play. Also idk what kind of system so that if the player decides to join a division where they have to pay to play they are linked to either paypal or payment is done there in the website whatever is easier and it shows that they have paid. The main point of the website is to be a face for the tournament that i will host online so that they can see how many teams have signed up, a countdown timer showing time left to sign up, maybe a forums section where they can post things and information on the tournament itself.