Again, this is mentioned in the docs: http://docs.particle.io/photon/webhooks/#handling-web-responses please do take a look, and read the whole page. That should give you more insight as to what’s going on.
There are also quite a few topics about this on the forum. Please try the search functionality, and I’m sure multiple topics will pop up. Here’s a useful one to get you started:
Cloud JSON Parsing
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