i discovered that credit card debits are linked to subscriptions to online services. Following a registration on a website, there have been one or more info items taken by BLSUPT. This can be the result of registration for a contest, discounts, dating sites, films/series, video games, clairvoyance, etc. There are thousands of sites with attractive offers (at least at first glance) that offer a subscription system.
By subscribing (even when you do not realize it at the time), the company linked to BLSUPT is authorized to make monthly direct debits on your bank card. It works like a SEPA direct debit, but with your bank card whose information has been communicated.
And many sites that handle the billing questions and cancel the memberships, sometimes with up to 60 days of refunds.