Yea I had seen @Terri_Baker post in Treatlife integration? - #2 by Terri_Baker also. Apparently changing the speed is not an option doing it this way and I was hoping to be able to turn it on and off and also change the speed. Similar to how I am able to do this with my Leviton Decora Fan Switch (fortunately and unfortunately this was easily done because it’s readily compatible with ST). I really appreciate and thank you so much for the quick response @JDRoberts ! I actually tried to test it out regardless of knowing that the speed setting would not be available. Idk if it’s because my wifi switch is solely for the fan and Terri’s was a fan/light switch combo but I’ve also run into some problems with this method. I’m able to link the Smart Life account I created and was able to add the fan switch to the Smart Life app, however the device is oddly not showing up in ST 
Not sure what I’m doing wrong here… when I try and add a device to ST, I chose the brand Smart Life and then options pop up to choose a device type. I choose “lighting” since “fan” isn’t an option. I’m wondering if this is part of the problem. Ik the ST app did an update yesterday, I’m also wondering if it is part of the problem?
Regarding the custom option, do you know how I could find out whether or not Treatlife has an open API?