Call a url when user get reward with Channel Points

API
25

hello, i created the custom reward by the api:

import requests
	headers = {
		'Client-Id': 'vdevjpxyrzii52pqjuomsvomixeazr',
		'Authorization': 'Bearer %s' % session.access_token,
		'Content-Type': 'application/json;'
	}
	payload = {
		'title' : 'teste api aureo',
		'cost' : 100
	}
	url = 'https://api.twitch.tv/helix/channel_points/custom_rewards?broadcaster_id=168327867'
	r = requests.post(url,headers=headers,params=payload)

and the error is the same when i try to get the redemptions, i think:

{"error":"Unauthorized","status":401,"message":"incorrect user authorization"}