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Help With Web Request - POST Time and Temperature to Google Sheets

Preface: For my first web request, I wish to post the time and temperature to the end of a Google Sheet each time a motion sensor is tripped.

Code.gs: I’ve based my Post/Get code off of this great blog on the subject
Google Sheets as a Database – INSERT with Apps Script using POST/GET methods

I am ‘confident’ my Google side is online and working and a test of the sheet did show from the Google side success. I am using JSON, the Sheet name is filled in correctly, and I’m using the proper key in all the right spots.

I guess my question is, am I missing any part of this method to get this to work?

As for my Piston:

UPDATE 1:
I’ve revised my .gs code and I’m am receiving ‘something’ into the sheet now. However, the data I’m receiving is ‘undefined’.

Question: Is there a way to print the web request going to google to see what the data is?

UPDATE 2: WORKING I had to change the output of the Piston Web Request from JSON to FORM.