Could you add toggle function (if is off turn on, if is on turn off) on IFTTT (like Philips Hue, Xiaomi Yeelight, WeMo etc.), it would be usefull in many scenario for example: use one button or one link (webhooks) to toggle the light.
Usefull also in the case of 3-way phisical switch connected to sonoff 4ch-pro.
A toggle action would be very useful for how I would like to use IFTTT with my Sonoff switches
+1 for toogle, both in eWeLink, IFTTT, Google Home, Amazon Alexa