I host an Australian E-com store our main currency set in AUD in settings. We have a market set up for the USA and have selected USD currency for that market. We have been advised by our USA custmers that the pricing on the website and cart is showing in USD but it changes to AUD at the checout page (and auto adjusts the amount based on the foreign exchange rate). Does anyone know what is causing this and how we can show the checkout page in USD for that market?