title: Verify email using mailgun api in codeigniter
body: <p>I used the code in <a href="https://documentation.mailgun.com/en/latest/user_manual.html#email-validation" rel="nofollow noreferrer">This link</a>
  It's showing the error :
  "require(vendor/autoload.php): failed to open stream: No such file or directory"</p>
  
  <p>How can I include the autoload.php file? I couldn't find it in mailgun sdk. And should I really use composer (Which I found in many sites to install composer)? I am using Codeigniter framework.</p>
  
  <p>Please help.Can you please tell me how to use this code in CodeIgniter.</p>