Here is how I made it work with Locative. The URLs used for MakerAPI will be the same whether used via Locative, Tasker, or any other app that can make a web call.
In the Locative App, under SETTINGS, make sure you have Global Http Settings configured for "GET", not "POST"
You can easily test by pasting in the following two URL's on that same page and clicking "Send Test-Request"
Your URL format posted above is a little bit off...
Go back to your MAKER API App on your hub, and scroll to the bottom where you should find the following section:
Send Device Command (replace [Device ID] with actual subscribed device id and [Command] with a supported comman…