Session Binding

[gboul]

First let me explain a bit about what we are trying to do.
We have developed a mobile/tablet application that allows the user to use certain online shops.
At the moment we are developing the interface to the virtuemart, so that our application can be used with online shops that are based on virtuemart. 
In order to provide a transparency to the actual application that runs on the mobile, we have a hub service that the application sends the requests and then hub takes these requests and uses web services to communicate with the virtuemart.
Most of the functions are handled by our hub apart from the checkout. For the checkout we are sending the actual checkout link to the application on the mobile device, which it opens with its browser. 

The problem is that we have two sessions, one session is the one that the hub is used to communicate with the joomla/virtuemart and the second is the one that the browser on the mobile/tablet device. We need to either bind the two sessions or somehow transfer the cart from one session to the other.

We are relative new to the virtuemart. I was wondering if there is already a solution to this one provided by virtuemart (possibly in the cart helper).

Any input will be appreciated.