How can Allow opencart, and prestashop and wordpress share the same database

Hello wordpress please I am using wordpress, opencart and prestashop together but I want my woocommerce and prestashop to share the same database information like users, vendors,products and so on without export any file. and same goes to my opencart and woocommerce. please help me out. Because i want to use only one homepage for all. please help I am new here