Hi Harlan,
I wanted to let you know that there's currently a JS error in the Try it Now Link:
"Google Maps JavaScript API error: DeletedApiProjectMapError"
This was created in 2017.
I don't have time to maintain this plugin.
But thenks to you, I've fixed the Try It Now screens, it just need new api key (expired).
Try it :)
https://harlin.outsystemscloud.com/Heatmap_Sample