FILL BLANK
Fill in the blanks to complete the Python script to request a service ticket using the APIC-EM REST API for the user "devnetuser".
import requests
import json
controller = 'devnetapi.cisco.com/sandbox/apic_em'
url = "https://" + controller + "api/va/ticket"
payload = {'username': '_________________', 'password': '370940885'}
header = {'Content-type': 'application.json'}
response = _______________________.post(url, data=json.dumps(payload),
\
headers= ______________________, verify=False)
r_json = response.json()
print(r_json)
ticket = r_json["response"]["serviceTicket"]
print(ticket)