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’: ‘________A_________’, ‘password’: ‘370940885’} header = {‘Content-type’: ‘application.json’} response = ___________B____________.post(url, data=json.dumps(payload), headers= ___________C___________, verify=False) r_json = response.json() print (r_json) ticket = r_json[“response”][“serviceTicket”] print(ticket)