Hi Jerome,
sorry for my English, what I mean is not to have "recurring payment", but:
1 - set the Hika "subscription product"
2 - from this time all users buying the "subscription product" that cost 100 € will be added to the group X and at the end of the period (one year) they wil be token away from group X (if they don't renew before the end date with a discounted price of 70 € ).
3 - At the mean time import in the DB all the subscription "users" with their "end subscription dates" (I stored manually till now). These users are yet in the group X.
4 - So, from now, for all the users, also the imported ones, HikaSubscription 60 and 30 days before the subscription end date will send an email to the user to renew (pay again, so not a recurring payment) it's subscription before it's end. Renew before the end date mean to pay 70 € and not 100 €, it's subscription end date will be moved and user will countinue to be in the group X.
That's all...