Accessing BigCommerce Logged In user from wordpress on subdomain -

so need way lock down both bigcommerce , wordpress if user not logged in. first suggestion asking if when user created in bigcommerce create same user account in wp... doesn't seem approach me since user not need interaction user on wp need block access pages if not logged in.

so thought check if user logged bigcommerce, pass variable wp header file. if variable not exist redirect them bigcommerce login. install bigcommerce using header wp match , works why assume should able pass variable check if user logged bigcommerce or not. have not been able find documentation in api accessing if user logged in or not.

has done , or know if possible? or know of better solution trying do. maybe check cookie or session?

recently did project client wanted show custom content bigcommerce loggedin users , block rest. best way found check value of %%global_currentcustomerfirstname%%. "guest" non-loggedin users. can try this:

localstorage.setitem("user", %%global_currentcustomerfirstname%% ); 

and can use on wordpress pages :

var  user =  localstorage.getitem("user"); if(user=="guest"){  //redirect login or block page } 

obviously can around javascript using ajax store somewhere , retrieving more secure hope proceed :)