Thingspeak multiple fields problem

[ScruffR]

Seen my edit above?

BTW, there is a ThingSpeak library too, maybe you can get around webhooks completely.

ThingSpeak Communication Library written by the ThingSpeak development team

This library enables a Particle Photon or Core to write or read data to or from ThingSpeak, an open data platform for the Internet of Things with MATLAB analytics and visualization. See the 90 second getting started video ThingSpeak offers free data storage and analysis of time-stamped numeric or alphanumeric data. Users can access ThingSpeak by visiting http://thingspeak.com and creating a ThingSpeak user account.