Ecwid / Lightspped eCommerce - Login to access website plugin/app

I am looking for an Ecwid Ecommerce App or plugin that restricts access to my site, unti lthe customer logs into their account. not just a password gatekeeper, that free app already exists. I only sell to existing client, no one else should be able to access my site, the products, anything until they log in. The pop up or splash page or homepage should contain only the wfollowing: - Logo - Instructions to login to access the site etc - a place to login - a link to reset password - *maybe* a link to sign up, but i would want to approve any accounts before they were live and able to sign in. Thats it.you can turn around and sell this app in the marketplace for all i care, i just need it for me, for free, for the amount im paying for it in this job.