Downlink encoder driver

Downlink encoder driver

Hi, 

I use a custom Driver for an end-device (uplink decoder and downlink encoder). The decoder works but for the downlink encoder I can't find in the documentation the JSON object properties to send to ThingPark. When I send a downlink raw payload I used this one which works :

    "DevEUI_downlink": {
        "DevEUI": "My-Device-EUI",
        "FPort": "1",
        "payload_hex": "01020304"
    }

What is the object property to add to send my JSON downlink object ? Can someone show me in the documentation where to find this information ?

Thank you.