SlackのPDFからGPT-4oで送付書データをGoogle Sheetsに抽出

• •Slack Bot Token または Webhook URL
• •ターゲットAPIの認証情報が必要な場合あり
• •Google Sheets API認証情報
• •OpenAI API Key

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        "text": "=---\nInvoice date: {{ $json.invoice_date }}\nBilling to: {{ $json['billing to'] }}\nEmail: {{ $json.email }}\nTotal Amount: {{ $json.total_amount }}\nDue date: {{ $json.due_date }}",
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      "parameters": {
        "url": "={{ $json.files[0].url_private_download }}",
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        "text": "=please read and understand the input data({{ $json.text }}). I would like you to extract billing to, email, total amount, invoice date and due date. ",
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        "content": "## How it works\n1. Receive invoice in Slack – When a PDF invoice is uploaded to a designated Slack channel, the workflow is triggered.\n2. Fetch the PDF – The file is downloaded automatically for processing.\n3. Extract data from PDF – Basic text extraction is performed to capture invoice content.\n4. AI-powered invoice parsing – An AI model interprets the extracted text and structures essential fields such as company name, invoice number, total amount, invoice date, and due date.\n5. Save to Google Sheets – The structured invoice data is appended as a new row in a Google Sheet for easy tracking and reporting.\n6. Slack confirmation – A summary of the saved invoice details is sent back to Slack to notify the team.\n\n## How to use\n1. Import the workflow into your n8n instance.\n2. Connect Slack – Authenticate your Slack account and set up the trigger channel where invoices will be uploaded.\n3. Connect Google Sheets – Authenticate with Google Sheets and specify the target spreadsheet and sheet name.\n4. Configure the AI extraction – Adjust the parsing prompt or output structure to fit your preferred data fields (e.g., vendor name, invoice ID, amount, dates).\n5. Test the workflow – Upload a sample invoice PDF in Slack and verify that the data is correctly extracted and saved to Google Sheets.\n\n## Requirements\n- An n8n instance (cloud)\n- Slack account with permission to read uploaded files and post messages\n- Google account with access to the spreadsheet you want to update\n- AI integration (e.g., OpenAI GPT or another LLM with PDF parsing capabilities)\n- A designated Slack channel for receiving invoice PDFs"
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        "content": "## Workflow\nAutomate Invoice Extraction from Slack to Google Sheets with GPT Model\n\n## Introduction\nManaging invoices manually can be time-consuming and error-prone. This workflow automates the process by extracting key invoice details from PDFs shared in Slack, structuring the information with AI, saving it to Google Sheets, and sending a confirmation back to Slack. It’s a seamless way to keep your financial records organized without manual data entry."
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