#!/usr/bin/env python

import requests

payload = 'username=myusername&password=password'
headers = {'X-Application': 'SomeKey', 'Content-Type': 'application/x-www-form-urlencoded'}

resp = requests.post('https://identitysso.betfair.com/api/certlogin', data=payload, cert=('client-2048.crt', 'client-2048.key'), headers=headers)

if resp.status_code == 200:
  resp_json = resp.json()
  print resp_json['loginStatus']
  print resp_json['sessionToken']
else:
  print "Request failed."

URLFetch[" https://identitysso.betfair.com/api/certlogin", {"StatusCode",    "Headers", "Content"}, "Headers" -> {"X-Application" -> "nilostep", "Accept" ->,"application/json"}, "Parameters" -> {"Username" -> "myusername", "Password" -> "mypassword"}];