Why is this not working?

add_account_v3.py

import requests
import json

# add the Admin API access key where it says access key in the headers value

cc_api_url = 'https://api.cloudcheckr.com/api/account.json/add_account_v3'
headers = {'Content-Type': 'application/json', 'access_key': ''}
params = {'account_name': 'test_account'}


r = requests.post(cc_api_url, headers=headers, data=json.dumps(params))

print r.json()

CloudCheckr requires the data to be json format, hence the json.dumps()

Thank you!