This API provides a comprehensive view of your IBAN account balances.
By default, it returns the balances for all associated IBAN accounts.
You can narrow down the results using optional query parameters to filter
by a specific account ID or currency code (e.g., EUR, GBP). The response
details the account status and provides a granular breakdown of funds across
different states: available for use, locked for pending transactions, frozen,
currently in transit, and the total overall balance.