Code injection for premium members only


I was wondering if anyone knew how I would go about making code injection only appear for premium members?

I have currently got a system setup that allows people to listen to my articles via BeyondWords, but I would like to make this feature only available to paying subscribers. Currently, everyone can see and use this feature, even non-paying members on private articles. Could anyone give me some advice here?


I would also like to know about it.

Ghost is pitching itself as a members-focused platform first and I think features like this are essential for publishers to run a member-focused website.