|Description||Mandatory parameter used for creating a subscription that allows to define the subscription start date.
For a SEPA direct debit, the due date must be at least 14 calendar days from the submission date of the form (vads_trans_date).
This parameter does not always match with the date of the first installment that depends only on the vads_sub_desc parameter.
The effective date indicates from which day the subscription starts. The date format is AAAAMMJJ.
Example: for February 1st 2015, enter 20150201.