Snype:
Rod
You say that Zen Cart support multiple currency. I think this is what I have already done as I added the currency picker (the side box). However it requires the admin to manually update the exchange rates.
I did not previous word it correctly. I haven’t installed a module more added the currencies side box to my layout.
How can I get zen cart to update the rates on its own. I am unfamiliar with this process.
The updates can be 'forced' (no need to enter exhange rates) from
/admin/localisation/currencies and clicking on the 'update currency' button.
To perform this automatically you'll you'll need to install the automatic currency update mod.
http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=430
For further enhancment you might also want to take a look at the 'user currency' module.
http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=284
Snype:
I guess if all the prices where displayed in a user native currency and the rates updated automatically, it should be fine for paypal to have the currency in AUD. As long as the conversions match up.
It works fine for us.
Snype:
Be nice if the system could use the same rate servers as paypal.
It probably can/does. It really depends on which servers PayPal uses.
Even if not, as long as the exchange rates are updated regularly there will only be a few cents variation for any given order. In other words, the default servers are close enough for practical purposes. Sometimes the 'error' will be a few cents in your favour, other times it'll be in the customers favour. Theoretically it all balances out.
Having said that, there is an entire industry of stock market 'day traders' that essentially make a living out of the hourly/daily exchange fluctuations, and they count on the fact that it doesn't have to all balance out. They need to buy and sell at exactly the right time though. A few minutes delay can make the difference between profit and loss. A zencart store doesn't need this kind of accuracy though. A daily update is more than sufficient.
Cheers
Rod