Habbo creds?????????????????????????…

Ok I play this game called Habbo Hotel (HH). You buy credits with real money but you have to pay by credit card, and I just have a Halifax card. I really want some credits and I have the money for them, but my mum and dad refuse to get them for me with their cards because they don't want me to play MORE on it. How can I get credits, or persuade them to get them for me? Thanks!