Added User ID to webhook headers

app/workers/webhooks.php

@@ -81,6 +81,7 @@ class WebhooksV1
                     'Content-Length: '.\strlen($payload),
                     'X-'.APP_NAME.'-Webhook-Event: '.$event,
                     'X-'.APP_NAME.'-Webhook-Name: '.$name,
+                    'X-'.APP_NAME.'-Webhook-UserID: '.$userId,
                     'X-'.APP_NAME.'-Webhook-Signature: '.$signature,
                 ]
             );