Passing user credentials to subdomain


I'm trying to setup a social marketplace with buddypress and enable users to sell stuff. I will open a subdomain like, where I'll use the Dokan theme to enable users to sell their used stuff.

However, when a user is logged in to and navigates to, I need to pass the user's credentials to Dokan theme running under so that the user does not have to login again, and the user is seamlessly transferred back and forth from the subdomain.

My question here is that, can I do it with the User Sync plugin. Thanks for your support.