A good setup should connect LINE customer booking and staff operations in one system.

Customer flow: choose service > choose barber > choose date/time > confirm.

Owner/staff flow: instant booking notification, calendar visibility, and a live queue display for in-store operations.

Customers tap “Book Queue” from rich menu and open LIFF directly inside LINE.

Step 1 allows selecting both service and barber in a single screen.

Label can be business-specific: “Choose Barber” (barber/nail), “Choose Table” (restaurant), “Choose Room” (meeting room).

Step 2 lets customers pick date and available time slots before final confirmation.

After success, a booking confirmation card is sent back into LINE chat with queue number and appointment details.

Each new booking creates a back-office notification so staff can react immediately.

Calendar view helps the team see daily/monthly booking distribution and peak windows.

Daily queue list separates statuses clearly (confirmed, completed, cancelled).

Digital signage shows now-calling and next queue to reduce manual queue shouting at the shop.

Separate services by real operations (e.g., haircut, haircut+wash, coloring) with correct duration.

Create each barber as a resource so customers can choose a specific person and avoid collisions.

Configure working hours and holidays per branch to ensure accurate slot availability.

Keep notification bell and queue signage active during opening hours for faster front-desk operation.

Complete one full booking test from real LINE mobile.

Verify notification appears and booking lands in calendar/booking list.

Verify queue display reflects now-calling and next queue correctly.

Once all checks pass, the shop can go live with the same tested flow.