The Club GG app itself does not facilitate playing for real money. They don't accept payments for chips and they won't send you funds in exchange for chips. As far as Club GG is concerned, all play on the app is for fun - all bets are in play-money chips and the chips do not represent dollars or any other form of real-world currency.
That said, it is possible for someone to set up a club on the Club GG app and exchange chips for real money for their club members. Club GG would not know about or condone this activity. However, there isn't much they could do to stop it, since it would all occur off the app itself.
So how would one go about finding a Club GG club that will let you play for real money? Unfortunately, there isn't a directory of clubs officially approved by Club GG, nor will Club GG help you find a club if you ask them. In other words, you are on your own finding a club.
The best way to find out about a real-money Club GG club is to ask around at your local card room, home game or casino. Trust is very important when playing in a Club GG club since you are relying on someone to keep their word to pay you if you win. Therefore, it would be ideal if your contact at a club is someone you know personally or at least someone you see in the real-world on occasion.
If you can't manage to find someone within your social network who either runs a Club GG club or knows someone who runs a club, your next option is to search online. Querying "Club GG Clubs" on Google or Instagram should provide you with a few options to review.
After you find someone who runs a real-money club, they should provide you with a club ID code and possibly a referral code as well. Once you have this information, go to the main lobby on the Club GG app and click the magnifying glass on the right side of the screen, about 1/4 of the way down from the top. A popup will appear prompting you for the club and referral codes. Enter them and click the "Next" button.
You will then have to wait until one of the club managers accepts you. Once they do, you will see the club banners for which you are a member in the middle of the main Club GG app lobby. Clicking on any club banner will bring you to the lobby for that club and you will see the tables available for that particular club. However, before you can actually play in a private club, you will need to get chips.
Once you belong to a private club, you will have to contact a club manager or agent so you can get chips. Usually this will be the person who told you about the club in the first place. Occasionally the club will put a contact point such as a phone number on the club banner in the app itself, so you can check there as well.
In any event, you do not buy chips directly through the app. You must contact someone off the app and they will either load chips for you on credit or tell you where you can send funds to buy chips. Again, there is no way to buy chips through the app to play in a club that you do not run yourself. Do NOT buy diamonds thinking that will allow you to buy chips and play for real money!
If you are playing in a club or buying chips from someone you don't know and trust personally, you must remember that you will have no recourse if they run off with your money. Club GG does not condone playing for real money on their app and they are in no way responsible for any funds sent to third parties.
Therefore, it is highly recommended that you start with small deposits when playing with a new club or agent and build trust slowly. After you have sent a few deposits and withdrawn some funds as well, then you can start to increase your deposit size if you are interested in playing higher stakes.