Just a quick follow-up in case anyone is interested…
I made this work by running HomeSeer HQ4 and tied a virtual switch to my OpenGarage via IFTTT. IFTTT updates the switch. HQ4 events send web requests to OpenGarage when the switch is toggled.
Alexa integration with HS4 shows the switch which enables me to control my door. I set routines up in Alexa to respond to “Open Garage Door” and “Close Garage Door” to toggle the switch.