If your base currency account (determined by your address) has insufficient funds when a merchant attempts to charge you for a subscription, the payment will be charged to your next active account with enough funds. This may require a currency conversion, and there may be applicable fees (e.g. fair usage, weekend fees, etc.). Learn more about the fees here.
For example, if you notice a subscription payment charged in USD instead of EUR, you should check if your EUR account had enough funds when the payment was charged.
Check your card settings. If you chose a specific currency or crypto account for spending and didn’t have sufficient funds when a subscription payment was attempted, the payment will be declined. Please top up your account as the merchant can re-attempt the payment later.