Outlook Web hook Subscription - python-3.x

Question

I am working with Outlook Webhook Subscriptions and working on QA server.
According to the Microsoft Graph documentation, we need to send the request to get the webhook notification. I am using Python 3 request module for this.
I am sending the following data but getting the error. I can't figure out where I am going wrong in the process.
url="https://graph.microsoft.com/v1.0/subscriptions"
header={
'Content-Type': 'application/json',
'Authorization':"Bearer "+ "valid access token"
}
data={
"changeType": "created,updated",
"notificationUrl": "https://qa.example.com/get_webhook",
"resource": "/me/mailfolders('inbox')/messages",
"expirationDateTime": "2018-12-11T11:00:00.0000000Z"
}
response=requests.post(url, headers=header, data=data)
After executing the above lines I am getting the following <400> response
'{\r\n "error": {\r\n "code": "BadRequest",\r\n "message":
"Unable to read JSON request payload. Please ensure Content-Type
header is set and payload is of valid JSON format.",\r\n
"innerError": {\r\n "request-id": "3a15ba2f-a055-4f33-a3f8-
f1f40cdb2d64",\r\n "date": "2018-12-10T06:51:32"\r\n }\r\n
}\r\n}'

Answer 1

To post as JSON, you need to json property rather than the data property (i.e. json={"key": "value"}:
url="https://graph.microsoft.com/v1.0/subscriptions"
header={
'Content-Type': 'application/json',
'Authorization':"Bearer "+ "valid access token"
}
data={
"changeType": "created,updated",
"notificationUrl": "https://qa.example.com/get_webhook",
"resource": "/me/mailfolders('inbox')/messages",
"expirationDateTime": "2018-12-11T11:00:00.0000000Z"
}
response=requests.post(url, headers=header, json=data)

Answer 2

You can use:
import json
response=requests.post(url, headers=header, data=json.dumps(data))