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.
In the case of a payment order, this field will be set to
the user account (login ) that created the order.
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).