I have scanned the index.js file for this package and I don't see any support for the building of the JSON packages needed to perform various In-Skill Purchasing (ISP) operations. Is that not supported with this package?

If it is not supported yet, is there a sample somewhere that shows me how to inject custom Alexa API handling into this package so i can add the necessary code? I'm hoping (very much so) I don't have to switch over to the official Alexa SDK just to add ISP to my current app that uses the alexa-app package.