this is exactly what I am looking for, can you share your solution on this?
did that link ( Using Spark.publish() with Simple JSON Data ) worked for you.
I also have the webhook with the material ready to talk to another cloud "Artik.Cloud", the webhook works. As of now, I have fixed values as place holders in my webhook, but is time to move to variables published by particle core, and I have the same questions you have above.
In contrast with what you had, I am publishing an array of integers so my string can extend
here is my post: