@abc.abstractmethod<EOL><INDENT>def convert_currencies(self, source_currency_amounts):<DEDENT>
return<EOL>
Converts currencies.

        :param source_currency_amounts: the currency amounts to convert
        :type source_currency_amounts: ``osid.financials.Currency[]``
        :return: resulting currency units
        :rtype: ``osid.financials.Currency``
        :raise: ``InvalidArgument`` -- ``sourceCurrencyAmount.get_currency_type() != get_sourcecurrency_type()``
        :raise: ``NullArgument`` -- ``source_currency_amounts`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*