Building a custom module  off of AS where users will have access only if they belong to that group.

In implementing jquery for ajax - I want to verify my user has access to the group in question - since I have to pass the group id in my $.ajax post.

I can already verify who my user is via DNN - but I want to make sure that the user actually belongs to the group before I add items to my custom module.  I'm not seeing anything that does this in the AS API --- is there a "round about" way of achieving the desired result?

Ideally I would think: 
bool theUserBelongs = new Active.Modules.Social.API.GroupsAPI().CanAccessGroup(activeSocialGroupId, userId);

In case anyone needs this - I created my own stored procedure passing in @UserId and @GroupId in question

Hi Jon,
I am creating a custom App that integrates with Groups. I am trying to get the GroupId to be used with my module. Can you give some direction as to the best way to do this in the API.

Thanks