Review and approve Google Sheets orders by email and notify via LINE

Description

Automatically processes new orders added to Google Sheets. Small orders are approved instantly; large orders trigger an HTML email with one-click Approve / Reject links — each handled by an independent webhook, so multiple orders can be reviewed simultaneously without blocking each other.

What makes this different
Unlike Wait-node designs that block when multiple orders queue up, this workflow uses a stateless token pattern: each order gets a unique token written back to the sheet. Approval links carry the token; the handler validates it on every click — safe, idempotent, and fully concurrent.

Key features
Google Sheets Trigger polls for new rows automatically — no external caller needed
Configurable approval threshold (default: 500)
Duplicate-processing guard: skips rows that already have a status
One-click Approve / Reject email with styled HTML buttons
Token validation: tampered or expired links return a 403 error page
Already-processed guard: clicking the same link twice shows a friendly message
LINE push notification for every outcome (auto-approved, approved, rejected)
All results written back to Google Sheets with a reviewedAt timestamp

Integrations
Google Sheets · Gmail · LINE Messaging API · n8n Webhook

Required sheet columns
orderId · customerName · amount · approvalToken · status

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