Webhook verification in PHP

[Mahfuz Arifin]

I created a webhook in DrChrono. Then click verify webhook button. after that when i click on "Check verification status" it says "verification in progress".  It's already 2hours gone. What should I do? Can you please help me. 

This is my code at webhook endpoint:

   header('Content-type: application/json');   

   $msg = isset($_GET['msg']) ? $_GET['msg'] : "crmblokes";

  $res = hash('sha256', $msg);

  $response   = array('status' => 200, 'secret_token' => $res, 'response' => 200);