Anyone got any idea how to interact with Nexus 4's subscriptions?

Also, does anyone know where the documentation is for all/any of the code?  Feel like I'm fumbling around in the dark at the moment guessing what methods there might be and what they would be called!

What are you trying to do?

We have a forum that you can post too but only if you have a subscription (you can view without a subscription but not post).

There are two types of subscription, one that expires after a year and one that expires after a single use.  For this I have set up two products in IPNexus, these both use license keys. One that has Unlimited uses and one that has a single usage.  The idea is that after they post the forum consumes a license which seems to have been possible with the older software.

So two things really :

• Check if the user has an active license
• Consume a license on posting

Thanks for the help in advance 

Might be worth noting that if possible I'm hoping to do this in the template as a simple if statement would work wonders.  I just need to know where to check