LINE Notifications Help

Overview

Guests who check in via the LIFF app (LINE's in-app browser) automatically receive LINE Flex Message notifications instead of email notifications. No additional configuration is required on the facility side — this feature works automatically as long as LINE integration is enabled for the facility.

How It Works

Normally, check-in confirmations, checkout receipts, and reservation links are sent by email. When a guest checks in through the LIFF app, the system recognizes their LINE account and delivers notifications via LINE message instead of email.

Check-in Method Notification Channel
LIFF app (via LINE) LINE Flex Message
Standard web browser / other Email

Key point: Facility owners do not need to manually switch anything. Notifications are automatically routed to LINE when the guest checks in through LIFF.

Types of Notifications Sent

LIFF guests receive the following three types of LINE notifications.

Check-in Confirmation

Sent immediately after the guest completes check-in.

  • Header color: Teal
  • Facility name and room name
  • Check-in date and time
  • "View Check-in Info" button (links to stay details and key information)

Checkout Receipt

Sent immediately after the guest completes check-out.

  • Header color: Purple
  • Facility name and room name
  • Stay duration (check-in to check-out date and time)
  • Fee breakdown and total
  • Facility contact information (if configured)

Sent when directing a guest to their reservation details.

  • Header color: Blue (unpaid) or Teal (paid)
  • Button linking to reservation details

Requirements

For LINE notifications to work, all of the following conditions must be met:

  1. The facility has an active LINE integration configured (see LINE Integration)
  2. The guest checked in through the LIFF app (LINE's in-app browser)
  3. The guest has added the facility's LINE Official Account as a friend

Duplicate Prevention

The same notification will never be sent twice. The system internally tracks the delivery status for each notification per check-in. Even if a retry occurs due to a network error, guests will not receive the same message more than once.

Troubleshooting

Guest did not receive a LINE notification

Check the following items in order:

  1. Verify LINE integration is active: On the LINE Integration page, confirm that the facility's LINE integration shows a "Connected" status.
  2. Confirm the guest checked in via LIFF: If the guest checked in through a regular web browser, an email is sent — not a LINE message.
  3. Check friend status: If the guest has not added the facility's LINE Official Account as a friend, messages cannot be delivered. Provide them with the QR code.
  4. Check for blocking: If the guest has blocked the facility's LINE Official Account, notifications will not be delivered. Ask the guest to unblock it.

Guest received an email instead of a LINE message

If a guest checks in through a method other than the LIFF app (e.g., a regular browser or QR scan), an email is sent. This is expected behavior. To receive LINE notifications, guests must check in from the rich menu inside the LINE app.

Notification was received but the content looks wrong

Facility details such as name, address, and phone number are displayed in the LINE message card. If any information is incorrect, update the facility details on the Base Settings page.

FAQ

Q: Can a guest receive both an email and a LINE notification for the same event?

A: No. LIFF guests receive LINE messages only, and regular guests receive email only. The same notification is never delivered through both channels.

Q: What happens if LINE integration is not configured?

A: LINE notifications will not work. All guests, including LIFF guests, will fall back to email. Note that LIFF guests have an internal email address in the format line_...@line.unlockos.io, which is not a real inbox, so those emails will not reach the guest. To ensure LIFF guests receive notifications, complete the LINE integration setup.

Q: Do admin notifications also go through LINE?

A: Admin check-in and check-out notifications are configured separately under "Admin Notification Settings" on the LINE Integration page. The LINE notifications described in this document are for guests only.