Every bank account you link is added automatically to the Chart of Accounts as a balance account in the Cash and Bank group (for the Assets tab) – the code assigns all linked accounts to that group – with the account's name, masked number and currency taken from Plaid. Its Account Type and currency are locked and it can be deactivated by removing the institution on Connected Accounts. These accounts are what you pick in the Accounts field of a transaction, and they are labelled with their currency and last digits, e.g. Business Checking (USD, 4321).