title: Facebook messenger chatbot working only for me but not for other users
body: <p>I am having strange issue after i created facebook messenger chatbot app using <a href="https://github.com/pimax/fb-messenger-php" rel="nofollow noreferrer">pimax</a> implementation and i followed all steps and created facebook page for the app called <a href="https://www.facebook.com/MiTaxiApp/" rel="nofollow noreferrer">MiTaxi</a> i found that it works only for me! but when i test my app using any other facebook users by the way my app is a live</p>
  <p><a href="https://i.stack.imgur.com/u3eZo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/u3eZo.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/NluVF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NluVF.png" alt="enter image description here" /></a></p>
  <p>I am not sure what is worng the application work prefect but no one else can test it but me.</p>