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My client’s website allows for display of currency in USD, EUR, or GBP. Recently the website received an order in EUR currency even though USD is set as the default. Client contacted Sage Payment Solutions and was told the conversion to USD takes place before they receive the batch. What do we need to do to ensure all international currencies are converted to USD?

You could only enable usd. Or switch the currency to usd once the customer reaches the checkout page with a modification in the catalog/controller/checkout/checkout.php