Where do I place the API key in the Webhook settings?

[Rftop]

The answer depends on how you intend to use the webhook.
The common use case (for myself anyway) is to send the ThingSpeak API Write key with every publish.
That way, you will only need 1 webhook to send data to any ThingSpeak Channel.

This Post/Thread may help you:

Boron RC26 Stability - Random reboots - How to debug?

Sure, Here’s my “Starter Code” when @ScruffR was teaching me. https://go.particle.io/shared_apps/5bffec808bf964444d00150f This is pretty old, so the Webhook instructions in the Comments may have changed slightly (but not the JSON for the actual Webhook). The Sample code is long. The actual usage is pretty simple: snprintf(msg, sizeof(msg), "{\"1\":\"%.0f\", \"2\":\"%.2f\", \"3\":\"%.0f\", \"k\":\"%s\"}", SOC, lipoVoltage, tempF, myWriteAPIKey) ; Particle.publish(eventName, msg,…

The Webhook definition is a few posts below it.