Thanks to SD
I can confirm I have tested this, and all working.
Groupon purchase requires credit card entry, but doesn't check the address (I entered normal card details, but good news I live in BH 90210 lol)
Audible requires Amazon login, and uses Amazon payment details.
Remember to cancel your Audible membership before the 2 months is up!
Can you continue to access the book/account after canceling the subscription?