To manually test IPN webhook delivery: In PayPal Settings, go to Notifications Click IPN History View recent webhook deliveries Check "Resend" to retry failed notifications In the Developer Dashboard, use IPN Simulator:
                
                    Go to Developer Dashboard > Sandbox > IPN Simulator
                    Select event type (e.g., payment_successful)
                    Configure sample data
                    Click "Send IPN" Go to Developer Dashboard > Sandbox > IPN Simulator Select event type (e.g., payment_successful) Configure sample data Click "Send IPN"