I banged my head against the table for hours trying to make the script work on this page and then I figured out something. When viewing the page on the HA site, the variable tags {{value1}}, etc...do not display. I only see two quotes.
This is what I was seeing. ```{"event":"TestHA_Trigger", "value1":"", "value2":"", "value3":""}```
And I should be seeing this: ```{"event":"TestHA_Trigger", "value1":"{{value1}}", "value2":"{{value2}}", "value3":"{{value3}}"}
Above this section in the automation, there's a tag called { % raw % } which I'm unfamiliar with, but I made a guess that this needs to be inserted. I may have been wrong. If so, I hope I've identified a valid problem. Thanks!