title: login with twitter callback url error
body: <p>I want to login to app with twitter, i follow <a href="https://github.com/twitter/twitter-kit-ios/wiki/Migrating-from-iOS-Social-Framework" rel="nofollow noreferrer">this documentation</a>
  but i got this error </p>
  
  <blockquote>
    <p>[TwitterKit] did encounter error with message "Error obtaining user auth token.": Error Domain=TWTRLogInErrorDomain Code=-1 "Callback URL not approved for this client application. Approved callback URLs can be adjusted in your application settings" UserInfo={NSLocalizedDescription=Callback URL not approved for this client application. Approved callback URLs can be adjusted in your application settings}
    error:  Optional("Request failed: forbidden (403)")</p>
  </blockquote>
  
  <p>i found this answer in twitter developer documentation </p>
  
  <blockquote>
    <p>If you do receive this error message, please check the URL that you are using with the callback_url parameter in your oauth/request_token call and make sure that this URL has been whitelisted in your app settings on apps.twitter.com.</p>
  </blockquote>
  
  <p><a href="https://developer.twitter.com/en/docs/basics/callback_url.html" rel="nofollow noreferrer">and this is the link</a></p>
  
  <p>but i don't understand that, i don't know what to do 
  any help please ?</p>