Bitpay Bitpay Bitpay.  They offer their services in AUD currency.  Bitpay and Coinbase are hands down the leaders in getting merchants set up with bitcoin and handling their transactions to get rid of the risk of volatility. I  believe Coinbase only accepts merchants/consumers in America though at this time though.

They could find out all the information they need simply  be calling Bitpay and talking to them.  Of the top of my head though here's some numbers worth pointing out.... Over 12,000 merchants now accept bitcoins using bitpay , there's been over $100millon USD transactions through bitpay, they've handle LARGE transactions as high as $1milllion for a single transaction. Most transactions with bitpay are INSTANT(i'm sure there's a finincal limit on this though), the transaction goes through before there's ever even a single conformation on the blockchain..... this means in the rare attempt that someone might double spend, it doesn't matter for the merchant, it's bitpay that takes the loss and they have that accounted for in their business model already.


In your effort to educate local business owners, I suggest you pass along this link to them. https://bitpay.com/faq     
That should answer all if not most questions they have.  You might want to contact bitpay as well and see if they have any pamplets in pdf format or something that you can print out and hand to local business owners, that would save you ALOT of time of trying to explain things to people.

Good luck and thanks for spreading the word. It benefits everyone.