Eddy
2
avast is using more than 2 payment processors.
Very likely you where charge because you have auto-renewal (aka continuous protection) enabled for one or more products or you had a trial of a paid version and didn’t stopped it in time.
You give every company permissions to store details if you pay per credit card.
How else would a company be able to keep a record of a transaction as they must by law ?
Digital River doesn’t ask people to create a account unless you want to become a customer.
https://www.avast.com/faq.php?article=AVKB24