Trying to update GPS Location in a Thingspeak Channel, using a json Webhook from Particle

[ScruffR]

I thought you found your problem in the other thread

Unable to get Thingspeak to display multiple fields in a channel using webhook/web form

Problem found! In the Webhook config in Particle, I was changing the lefthand field contents to the label defined on Thingspeak for the corresponding field. This needs to be left as field1, field2 etc… Changing it to anything else ‘breaks’ the mapping of the fields in Thingspeak. However, thanks for the various input as along the way I learnt some new techniques. Thanks all