Your member card can be used as follows:

Access to the changing rooms (which can also be done with a daily code)
Purchases from the bar where you will get a 20% discount on drinks and a 10% discount on food. Top it up behind the bar as you go along (like an Oyster Card)
Swipe credits for Academy/Lifestyle rounds of golf. Please note that you must swipe your card in the Pro Shop (or Bar should the Pro Shop be closed) before commencing play
If you lose or damage your card, contact the Office and they will re-issue a new one.