I find that most of the credit card issuers don't automatically convert to USD -- this usually happens more on the merchant end. The problem is that you don't k

I find that most of the credit card issuers don't automatically convert to USD -- this usually happens more on the merchant end. The problem is that you don't know if the online merchant is doing this or not... it's a lot easier, say, if you're sitting down at a restaurant and find it happening.