In order to access information about a subscription, you can use the Subscription Context.
Information on the different types of context's can be found here: http://docs.apprenda.com/3-5/contexts
And Information on how to use the Subscription Context to get context information can be found here: http://docs.apprenda.com/3-5/features
More information about the methods that are available for you can be found here: http://docs.apprenda.com/api/class_apprenda_1_1_saa_s_grid_1_1_subscription_1_1_subscription_context.html
Please let me know if you need any more help,