Stripe PHP Webhooks.

webhook_handler.php

try {

  $response = Stripe_Event::retrieve($event_json->id);
  
  // If you get to this point, you have a valid Stripe Event.
  // You will do something with the response, which will be a Stripe_Event.

} catch (Stripe_InvalidRequestError $e) {

  // If you get to this point, you tried to request an invalid Stripe_Event.
  
  // This could be a bogus event id passed from a malicious user. It could
  // also be a test webhook that doesn't have a valid event id.
  
}