IFTTT has webhooks too that can be called from Homey. It used to be called Maker, now I believe it’s just called Webhooks too. Homey can call those through Logic and/or other apps. So it is possible to use webhooks both ways. I used to have those webhooks when I migrated from Homewizard to Homey and replaced them with the “real” IFTTT integration. Silly me, now I have to change those back.
