If the server to which Webhook is notified cannot notify due to a network failure, we do not guarantee it completely. In addition, no Webhook notification is delivered during PayPay maintenance.
If the webhook was not delivered, you can also check the transaction status using the payment reference API.
When sending a Webhook, if the response timeout (1.5 seconds) or an error occurs, the system will retry up to three times. If we send 3 times and it doesn't work, the Webhook will not be sent.