The law does not forbid you from storing any cookie, even if the user declined. The user can decline cookies that are not needed to provide what the user asked

The law does not forbid you from storing any cookie, even if the user declined. The user can decline cookies that are not needed to provide what the user asked for. Even after the user declines, you are allowed to use cookies to keep track of what's in the user cart, whether the user has logged in or whether the user rejected cookies.