Extract, validate, and log email invoices from Gmail to Google Sheets with GPT-4 — Workflow n8n

Moyen complexité Déclencheur12 nœuds🏷️ Invoice Processingpar Pratyush Kumar Jha

Aperçu

Inbox2Ledger is an end-to-end n8n template that turns a noisy finance inbox into a clean, structured ledger. It fetches emails, uses AI guardrails to keep only finance-relevant messages, extracts invoice/receipt fields via an OCR-style agent, validates and auto-categorizes each expense, generates a unique case ID, and appends the result to a Google Sheet for accounting or downstream automations.

Key Features

Trigger*: Form submission or scheduled fetch (sample *On form submission node included

Nœuds utilisés

Google SheetsGmailCodeAI AgentOpenAI Chat ModelGuardrails

Aperçu du workflow

Get all emails
Connect Gmail and fetch incoming messages or selected f
Inbox2Ledger is an end-to-end n8n template th
Filter finance emails
Apply AI guardrails and keyword filters to isolate invo
Extract details and log
Use LLM/OCR agent to extract vendor, date, invoice_id,
modelmodel
Get Email Content
Guardrail: Is Finance?
I
IF (Guardrail Passed)
F
Filter Finance Keywords
AI Agent (Email OCR)
Validate Extraction
C
Check for Errors
Apply Finance Rules
Log to Invoices Sheet
gpt 4o mini
OpenAI Chat Model
E
Enter Date till which yo…
12 nodes11 edges

Comment ça fonctionne

  1. 1

    Déclencheur

    Le workflow démarre avec un déclencheur déclencheur.

  2. 2

    Traitement

    Les données transitent par 12 nœuds, connecting agent, code, filter.

  3. 3

    Sortie

    Le workflow termine son automatisation et livre le résultat à la destination configurée.

Détails des nœuds (12)

GO

Google Sheets

googleSheets

#1
GM

Gmail

gmail

#2
CO

Code

code

#3
AI

AI Agent

n8n-nodes-langchain.agent

#4
OP

OpenAI Chat Model

n8n-nodes-langchain.lmChatOpenAi

#5
GU

Guardrails

n8n-nodes-langchain.guardrails

#6

Comment importer ce workflow

  1. 1Cliquez sur le bouton Télécharger JSON à droite pour enregistrer le fichier du workflow.
  2. 2Ouvrez votre instance n8n. Accédez à Workflows → Nouveau → Importer depuis un fichier.
  3. 3Sélectionnez le fichier extract-validate-and-log-email-invoices-from-gmail-to-google-sheets-with-gpt-4 téléchargé et cliquez sur Importer.
  4. 4Configurez les identifiants pour chaque nœud de service (clés API, OAuth, etc.).
  5. 5Cliquez sur Tester le workflow pour vérifier que tout fonctionne, puis activez-le.

Ou collez directement dans n8n → Importer depuis JSON :

{ "name": "Extract, validate, and log email invoices from Gmail to Google Sheets with GPT-4", "nodes": [...], ...}

Intégrations

agentcodefilterformtriggergmailgooglesheetsguardrailsiflmchatopenai

Obtenir ce workflow

Téléchargez et importez en un clic

Télécharger JSONVoir sur n8n.io
Nœuds12
Complexitémedium
Déclencheurtrigger

Créé par

Pratyush Kumar Jha

Pratyush Kumar Jha

@pratyush

Tags

agentcodefilterformtriggergmailgooglesheetsguardrailsiflmchatopenai

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Standard accounting templates often fail to reflect a premium brand identity. This sophisticated n8n workflow bridges the gap between financial record-keeping and professional client presentation. By moving beyond the native limitations of QuickBooks Online, this automation enables businesses to generate high-end, multi-page PDF invoices that align perfectly with their corporate styling. The process begins the moment a new invoice is generated in QuickBooks, triggering a webhook that captures real-time billing data. The workflow then utilizes advanced HTML-to-File conversion and custom Code nodes to structure data into a polished, branded layout. It handles complex logic such as line-item merging and multi-page formatting automatically. Once the document is rendered, the system bypasses generic 'no-reply' senders by routing the finalized PDF through your preferred email provider. This ensures a seamless, white-labeled experience for your clients while eliminating the manual overhead of exporting, styling, and attaching files. Ideal for agencies and service providers, this flow guarantees that your most frequent touchpoint—the bill—is as professional as your work. **Common Use Cases:** - High-end creative agencies requiring bespoke, white-labeled billing documents for premium clients. - Automated recurring subscription billing where custom tax disclosures or localized branding are required. - Service-based businesses needing to attach dynamic project reports or terms of service directly to QuickBooks invoices.

🔗 Webhook·12 nodes