Subscribe a function to one or more event types, optionally scoped to specific senders. Provide eventTypes and senderIds (use null in senderIds for all senders); a trigger is created for each event type and sender combination.

The special event type cron runs the function on a schedule instead of a messaging event: include a cron field with a 5-field UTC cron expression (minimum granularity one minute). A cron trigger ignores the sender axis, and a function may hold several cron triggers with different expressions. The function receives an event with type: "cron" and data.cron.

{
  "cron": "0 9 * * 1-5"
}

{
  "triggers": [
    {
      "cron": "*/15 * * * *"
    }
  ]
}