@abargel Well, actually, from the MySQL access in Web terminal, and a little help from the MySQL manual, it wasn't that difficult to find the table with
SHOW TABLES;
then
SELECT * FROM members_stripe_customers_subscriptions;
and add records with information from Stripe (and from the table members_stripe_customers) with
INSERT ... VALUES (see MySQL manual for format)
Sure, it is a bit tedious... But for a limited number of members, it can be done