Getting information from photon onto thingspeak

Getting Started
2

Based on a working webhook I have you need something like this:

{
    "event": "pot",
    "url": "https://api.thingspeak.com/update",
    "requestType": "POST",
    "query": {
        "key": "<thing-api-key>",
        "field1": "{{PARTICLE_EVENT_VALUE}}"
    },
    "noDefaults": true,
    "mydevices": true,
    "deviceid": "<particle-device-id>"
}

If the above is in a file called webhook.json, then use the particle cli to create the webhook:

particle webhook create webhook.json

Alternative you can directly call Thingspeak from firmware:

https://community.particle.io/t/thingspeak-communication-library-written-by-the-thingspeak-development-team/15415