For me to get this to work I had to add the "data=" parameter in the request: response = requests.post(url, headers={'X-Hub-Signature': hashed.hexdigest(), 'Content-Type': 'application/json'}, data=jsonStr)

Thanks so much for this post. Been trying to work this out. I notice there is not "data="/payload in the post request. Is this right? I am getting a http 200 back but data doesn't seem to be adding to the dataset.