Notify customers of unpaid cart items

What this notification does

The "Cart idle" notification reminds customers whose shopping cart has items that have not yet been paid for. It fires once per cart, after a configurable idle period, via push notification and/or LINE.

How to enable

1. Go to Admin → Custom Features → Advanced Notifications → Customer → Other.
2. Turn on the Cart idle toggle (app and/or LINE).
3. Pick the idle timeout — 15 / 30 minutes, 1 / 1.5 / 2 / 3 / 6 / 12 / 24 hours. Default is 60 minutes.
4. Customise the title and body. The CUSTOMER_NAME placeholder is available.
5. Save.

Edge cases

The notification does not fire for empty, completed, processing or deleted carts. The cron job that drives this check runs every 15 minutes and only triggers for carts whose idle time is between the threshold and the threshold + 60 minutes, so very old carts are not re-pinged indefinitely.