Your first check-in

In this tutorial you will send a check-in to a real Triple Pat timer and see the service record it. All you need is a terminal with curl installed.

The test timer

Every timer is identified by a UUID. For learning and testing, we operate a public timer using the UUID Wikipedia uses as an example:

550e8400-e29b-41d4-a716-446655440000

Because the UUID is published here, anyone can check in with it — including you, right now.

Send a check-in

Run:

curl https://triplepat.com/api/v1/checkin/550e8400-e29b-41d4-a716-446655440000

The service replies with the timer’s new state:

{
  "lastCheckinTime": "2026-08-02T12:57:28Z",
  "uuid": "550e8400-e29b-41d4-a716-446655440000"
}

lastCheckinTime is the moment your check-in arrived. Run the command again and watch the timestamp move.

What just happened

You did the only thing a monitored system ever needs to do: tell Triple Pat that everything is fine by hitting one URL. If check-ins stop arriving for too long, the alarm fires. That is the entire integration surface.

Next steps

• Install the phone app to create a timer of your own, with a private UUID and configurable alerts.
• Put your check-in on a schedule: check in from a cron job.
• Look up the details in the check-in API reference.