Instructions for setting up POP:
curl -k -s http://localhost:7733/api/v1/tools/hallmark/encode/your_ip_address/100/2017-01-01/your_secret_phrase\?api_key=your_api_key

Create a new file conf/heat.properties:
heat.apiKey=your_api_key
heat.myAddress=your_ip_address
heat.myHallmark=your_hallmark (generated from curl above)

Stop server and restart it. I could have kept this to myself and benefited, but no, I want HEAT to become a success and therefore I share it with the community.