Currency exchange rates not working

Just had an order that processed in pounds from the UK and that numerical amount (not actual dollar amount) was processed though my merchant account. I lost money on it and it was obviously an error. Looking into it appears that Opencart used a service provided by Yahoo to determine the exchange rates and Yahoo recently discontinued that service. I see a couple extensions for Opencart that purport to provide this service but would like to get feedback from others to help decide my course of action.

Yes, you need an extension, which replaces Yahoo: Exchange Rate Providers.

OK I have downloaded the extension and am having a service install it. I have almost no experience with this and they are asking me to select a provider and provide an API key. Do I need to register with a service provider ? If so, any recommendations?

Try this one:
https://www.opencart.com/index.php?rout ... n_id=36550
Foreign exchange rates published by the European Central Bank.

Thanks for the info agatha65, that free Extension works vqmodded
flawless with my 1.5.6.5_rc Designs ! It's good, to still have fellows like
famous GrandCMS around here once in a while ...
Ernie