SoftBank.Account.account_balance

You're seeing just the function account_balance, go back to SoftBank.Account module for more information.
Link to this function

account_balance(repo \\ Config.repo(), account_or_account_list, dates \\ nil)

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Computes the account balance for a given SoftBank.Account in a given Ecto.Repo when provided with a map of dates in the format %{from_date: from_date, to_date: to_date}. Returns Decimal type.