Do the Subscription Tools plans override the buil-in DotNetNuke role settings of Trial periods, Subscription services etc? Are you suppose to not use the built-in core role settings if you are using the Subscription Tools?

Also, I cannot find a way to specify a free trial period using the built-in DNN core role settings. Maybe think about including a plan for your Subscription Tools where you do not need to pay, i.e. a Trial Plan. Also think about removing someone from a role when there subscription expires; I have not seen this functionality anywhere and I believe it could be a common occurence, i.e.:

Create Trial Plan of let's say 3 months
When the trial expires, remove user from role that links to Trial Plan and insert them into a Guest role that may not require a plan (if they can indefintely remain a guest on the site). Reason would be that Guest can do less than Trialist.