I have a shop base currency in EUR. A customer puchases someting in USD, conversion rate is applied, invoice is in USD, payment in USD all ok. Customer remains with USD in his/her account.
One year later my EUR price is the same, but the conversion rate has changed. I update the conversion rate daily, so all products have current prices in all currencies.
What happens when the customer gets invoiced: does he/she get the same amount as last year or does he/she get the current