Same WooComerce shop for different WP sites?

Multi site will not solve your problem. Cause WooCommerce takes each site of multi site as a individual site. As far I understood you problem could be solved by using API’s and which need a heavy modification. Each site of user will communicate between them through API’s. When any of the product will be added or deleted or modified it will send a request to all other sites through API and they will update themselves. But as I said earlier it needs heavy modification.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)