@AZRushFan, yes, I just tried it. It worked for me with this text at the end of my configuration.yaml:
rest_command:
triggercmd_calculator:
url: 'https://www.triggercmd.com/api/run/triggerSave'
method: "post"
content_type: "application/x-www-form-urlencoded"
payload: "trigger=calculator&computer=russfam&token=(my token)"
7c976f0e-b70c-45b1-a3be-418b63a118c2-image.png
That said, would it help if I built an official Home Assistant integration?