Pay in USD, CAD, EUR, AUD, SGD, MYR, GBD, or CNY, on the FUM website.
For the website:
Currency settings are at the top of the page on the right hand side. You will see "USD" which you can click on to change to whichever currency you would like.
For the mobile site:
Click on the menu bar, on the bottom left hand side you'll see a currency indicator. Click and choose which currency you'd like to purchase in.