Messages are not sent instantaneously, but are queued by Twilio. Specify a Status Callback URL in your send request, and Twilio can POST each time your message status changes to one of the following: queued, failed, sent, delivered, or undelivered. Requires a FileMaker user with access to find and write message data. In this example file, see the “api.twilio” account and the MessagingMessages table. This entire process typically happens in just a few seconds.