Pre-paid credit or debit card and foreign currencies

Hello.

I just had a bit of a kerfuffle with paypal because i think my customer was not able to use a prepaid debit/credit card due to currency conversion issues.

My product is priced in CAD and he is in Texas using a USD pre paid debit or credit card.

What is the good way to get around this limitation? I would like the price to be set in CAD if possible to avoid any exchange rate swings.

I know in the screen cap it says the number is incorrect but it was same card used with the paypal option.

forgot the picture