vads_trans_id

Description	Mandatory parameter. It consists of 6 alphanumeric characters and must be unique for each transaction for a given shop on the same day. Note: the uniqueness of the transaction identifier is based on the universal time (UTC). The merchant website must guarantee this uniqueness during same the day. The range between 900000 and 999999 is reserved to the payment gateway, for the transactions made via: the Expert Back Office (refunds, duplications, manual payment, etc.), the data collection form, a payment order. Input and output field, returned in the response (IPN and Return URL).
Format	an6
Error code	03 Frequent errors: The form is rejected: If the transmitted value contains less than 6 characters. If the value is null. If the field is absent. If an identical transaction number has already been sent on the same day. If the buyer clicks “Cancel and return to the shop”, the transaction number must be different for the next attempt as the previous one will be considered as already used. Otherwise, the “The transaction has been canceled” message will appear.
Category	Transaction details.