title: How to handle InvalidSignatureException exception and return custom error json response in laravel
body: <p>I can't handle this exception. 
   - I used try-catch but this doesn't work. 
   - I used <code>$request-&gt;hasValidSignature()</code> but this doesn't work either. </p>
  
  <p>What can I do about this? Please help me and sorry for my English.</p>