I believe that this will work and I found it here. The JSON response looks correct but will have to wait until Thursday to test it out.
"https://api.particle.io/v1/devices/DEVICE/relay?access_token=TOKEN" method="POST"
Tell your device what to do!
<input type="radio" name="arg" value="on">Turn the relay on.
<input type="radio" name="arg" value="off">Turn the relay off.
<input type="submit" value="Enter!">
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