Credit Card account connection

Hi! This week I have become a proud Revolut physcial card owner. However, as I have also opened up accounts in CHF, EUR and USD, I am not sure which account will get debited in case I use the card. Is there a hard connection between the card and one of my accounts? Or does the card automatically access the currency account in which the transaction was performed? In which case the question comes up which account is debited in case of transactions in another currency, like THB. Thanks for the help!

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