Information about the user who made the payment.
In the case of a form payment, this parameter will be resent with the response and will include the value transmitted in the request.In the case of a MOTO payment from the Merchant Back Office, this field will be valued with the user account (login) who made the payment.
For backward compatibility, it is possible to use this field to set the CPF/CNPJ (legal identifier in a numeric format between 11 and 20 digits long) required by the ClearSale risk management module. However, vads_cust_national_id field can be used.
Input and output field, returned in the response (IPN and Return URL).