Yes, you can create a virtual device in Hubitat and then authorize that in SharpTools.
So from SharpTools, you could flip the Virtual Switch on… then in Hubitat’s Rule Machine, you could build a rule that would react to the switch turning on.
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You could either have the Hubitat rule turn the virtual switch back off or Hubitat’s Virtual Switch can be configured with an ‘Auto Off’ Setting which makes it act like a bit like a button (stateless):