I published all the source code for the OTP Demo I did over at TEC at https://github.com/ikrima/Public-Development

The source code contains a sample password reset activity using the interactive activity, the SMS One Time Password Authentication activity, an aspx web app that allows you to perform web based password reset, and the necessary public client extensions that allow you to talk to interactive activities (it would be easy to extend it to communicate to the OOB Password Reset Activity)