Buying Worldmark by Wyndham credits from overseas (AU)

Hi, I live in Australia and recently get involved with Worldmark by Wyndham's credit system.

I noticed that many members have their Wyndham credit for sale in US. Can I please ask whether I can buy these credits and use them in Australia?

What's the potential traps and limitations for this? Can I transfer the annual fee payment to Austalian dollars instead of USD? Is this kind of transaction achievable?

I am new to timeshare and points system, any response will be appreciated!

Thanks!

There is a forum called wmowners.com that has a lot of worldmark owners who could probably answer your question.