This attempts to call the Uber Eats Sandbox API to "inject" a test order. If successful, Uber should send a
webhook to your uber_create_webhook.php endpoint.
Note: This requires your Uber App to have the correct scopes and be in the Sandbox environment.
This bypasses Uber and sends a sample "Order Notification" JSON payload directly to your local
uber_create_webhook.php script. Use this to verify your PHP logic (Google Maps, Tookan, etc.).