n8n LINE Reply Workflow: Claude Drafts + Gmail Approval

Turn LINE messages into approved replies—drafted by Claude, cleared by Gmail

This n8n workflow receives incoming LINE Messaging API webhooks, drafts helpful customer responses using Anthropic Claude (backed by n8n Data Tables for availability), and emails the draft to your staff in Gmail

What this workflow does

• Processes LINE webhooks securely: verifies request signatures, splits batched events, ignores redelivered events, and accepts only text and image messages.
• Acknowledges immediately: replies via the LINE Reply API with an acknowledgment message while processing continues.
• Handles images: downloads image content from LINE and uses Claude to describe the photo so it can be treated like a text inquiry.
• Classifies the inquiry with Claude: identifies whether the customer is asking about stock, a store visit, or something else.
• Stock inquiries: extracts the product category, queries matching items from n8n Data Tables, and drafts a reply based only on returned stock data.
• Store visit requests: extracts desired date/time, looks up available visit slots from n8n Data Tables, and drafts a reply based only on slot data.
• Approval workflow via Gmail: emails staff the draft for approval (Send/Don’t send). If there’s a timeout, staff gets a reminder. “Other” inquiries are routed directly to staff by email.
• Sends the final response: pushes the approved reply back to the customer using the LINE Push API.

Use cases

• LINE customer questions about product availability answered with data-driven replies.
• LINE booking requests that return available store visit slots for faster scheduling.
• Human-in-the-loop support: Claude drafts, your team approves in Gmail.

Technical details

• Integrations/nodes: LINE webhook + LINE Reply API + LINE Push API, Gmail, Anthropic Claude, n8n Data Tables.
• Logic flow: uses nodes such as if, set, filter, no op, crypto (for verification/signature handling).

Note: To deploy, start by creating a LINE Official Account (required for webhook setup).