That switch uses the smartlife app. There are many other inexpensive Chinese Wi-Fi devices that also use the same app.
In May2020, SmartLife dropped their IFTTT channel due to increasing costs. Paul Hibbard, a tech blogger, says you can try the “brilliant smart“ app from Australia instead, as it has its own Ifttt channel. That company told him they recently renewed with Ifttt, so he says it should be good for at least a year. However, it’s always possible that the company will shut this down for brands other than their own if it starts costing too much money.
To use the IFTTT method:
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Create a virtual switch in smartthings to act as a proxy for the Wi-Fi device. You need one virtual switch for each Wi-Fi device.
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Create four IFTTT applets for each Wi-Fi device. one to turn the device on and one to turn the device off in each direction. So
2a) “if smartthings proxy switch turns on, then turn on Wi-Fi device.“
2b) “ if smartthings proxy switch turns off, then turn off the Wi-Fi device.”
2c) “ if Wi-Fi device turns on, then turn on the SmartThings proxy switch.“
2d) “If Wi-Fi device turns off, then turn off the smartthings proxy switch.”
That way if you turn The switch on or off with its own app, it will still stay in sync with the proxy.
That’s all there is to it. When you look at your smartthings app, you will only see the proxy switch, not the real Wi-Fi switch, but that doesn’t matter: it is showing you the status, and if you toggle it or use it in an automation, the real switch will turn on or off appropriately.
A different approach: Alexa as the “man in the middle”
Some community members have Set up a virtual contact sensor To trigger an Amazon routine (not a smartthings routine) and get integration that way. It’s clunky, but it can work for some households.
And here is the Alexa skill for smartlife. There’s some more technical information in the reviews, particularly about network requirements.
There are also a couple of community – created integrations. Just search for SmartLife. ( that’s a Chinese company, it has nothing to do with Samsung or SmartThings, just a somewhat similar name). These may involve flashing the firmware on the device.
My only concern is that If This is like other similar switches, it won’t have any safety certifications, and speaking just for myself, I don’t wire anything into the mains, even a light switch, if it doesn’t have safety certifications. The convenience of home automation isn’t worth burning down the house. But that’s just me. 
TPLink/Kasa brand devices
If you found this FAQ but you have the TPLink or Kasa brand WiFi Devices, those do not use the SmartLife App. They have their own app.
Fortunately, there are two good integrations available for those, one which is cloud to cloud and one which is to the hub but requires a “man in the middle” server. See the following thread:
I’ll continue to search
