title: vBulletin mobile API login_login?
body: <p>I'm new bigginer in vBulletin and I can not find a solution for my problems, I explain,</p>
  
  <p>I would like to create an iOS application that runs with Mobile API vBulletin 5.0, but Now, leave aside iOS.</p>
  
  <p>I would like to create a PHP code that authenticates a user, I already managed to get the result of api_init () so I can use the following vars apiclientid, secret and apiaccesstoken, but I didn't find solution to login a user, I'm calling the method login_login on the api but it return null !</p>
  
  <p>please can someone help on how we can login ? this will be really helpfull,</p>
  
  <p>thank you.</p>