Authenticating Checkout from CoCart

I’m building my headless woocommerce site with CoCart. The only snag is that I need to use woocommerce’s checkout. I can’t build my own on the headless side of my site. So I need to redirect from my custom front end to the woocommerce checkout. The issue here is that the cart is authenticated so I would need to be logged into the wordpress account (I’m using the wordpress api so it’s the same login) in order for the cart to show up in the checkout. Currently it says I have no items in my checkout because the user isn’t logged into the wordpress site. At the very least is there some way to load the cart items into the guest checkout?