Hello, been having issues all morning with this. Trying to get opencart to display the product price in USD, but have it float based on the exchange rate of BTC to USD. Basically as an example have an item in my store thats selling for 39USD, but in the backend i put in 1BTC for the product price. So that when the BTC rate fluctuates to lets say to 40USD, the item price in the front end would automatically change from 39 to 40USD.
Does that mean you are already using the OpenCart Bitcoin payment module?
If so, this variation might require an update (or fork) to add that direction (i.e., price at a fixed BTC, but displays USD determined dynamically based on the market rate.).
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http://en.bitcoin.it/wiki/OpenCart_Bitcoin