giro authorizations are specific to a particular vendor, containing standard data elements according to the giro requirements.
British Dictionary definitions for giro
noun (pl) -ros
a system of transferring money within the financial institutions of a country, such as banks and post offices, by which bills, etc may be paid by filling in a giro form authorizing the debit of a specified sum from one's own account to the credit of the payee's account
(Brit, informal) an unemployment or income support payment by giro cheque, posted fortnightly