I recommend installing the free demo version before paying for and check the need for session management. The OC Session Manager module is principally supposed for OpenCart 3. Opencart stores some user info (language, currency, cart, and many others.) in PHP classes. OpenCart can store this facts in two ways: https://prestashop-debug-mode89988.theobloggers.com/38009698/5-simple-techniques-for-opencart-google-tag-manager