Yes, pretty much. The params variable will contain all of your options that you send in your URL. If you send [fullurl]/Notify?deviceName=sensor1&status=open then:
params.deviceName will contain “sensor1”
params.status will contain “open”
In the snippet you asked about, I was looking for some specific text from [fullurl]/Notify?msg=messagetexthere
This new tutorial should give you a more complete example than the snippets I’ve been posting: