Smartnest works with IFTTT using Webhooks channel, here are the steps to configure it:
go to your account at IFTTT web page and click on get more and then create a new recipe with webhooks as the trigger and any service as the action, in this example we will use the notification.
After connecting the Webhooks channel in your IFTTT account it is necessary to add the Webhooks key in your account settings in Smartnest, here you can see how to complete this process.
Create a new recipe with any trigger you would like, in the example we use the Button channel, and add Webhooks as the action, "make a web request"
Change the device name to the name of your device and the powerState value for your desired action: ON or OFF.