raytaylor:Journeyman: Locate the Paywave wire loop in the card, drill/punch hole through it.
Pretty sure if you still use the magnetic stripe it will just ask you to insert the card so you would have to be careful not to damage the chip.
I have also heard of a few retailers say they have turned down the sensitivity on their eftpos handsets to prevent this from happening.
I had a bad expierence at i think it was harvey norman - i couldnt get the card into the machine without the paywave being triggered and declining the transaction which was over the paywave limit.
Ended up going to the ATM and going back.
There is no such thing as a "sensitivity". Terminals will only read a card within range, which is typically 2-3cm and a maximum of around 5cm
If you buy something over the Paywave/Paypass limit you simply need to enter your PIN to process the transaction. This is the norm for me lots of places (Z being a classic example) where purchases are often over the limit.
A few people above seem to think the NFC functionality is in the chip. It's not. It's an antenna array built into the card. If you damage your chip your card isn't going to work.