When on your Bookvault portal, navigate to 'Payments' page.
From this page you would be able to see your spending history, available funds and make top-ups, as well as add your Saved Payment method.
We will charge in GBP£ for any orders placed with Bookvault UK, and USD$ for any orders placed with Bookvault US. You may wish to have two seperate payment cards for these transactions, or add the same one that would be charged in both GBP£ & USD$.