Auto-generate WhatsApp proposals from voice or text using GPT & APITemplate

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

Best for

Lead Nurturing automation workflows
AI Chatbot automation workflows
advanced n8n builders looking for reusable templates

Tools used

@n8n/n8n-nodes-langchain.lmchatopenai, n8n-nodes-base.whatsapptrigger, n8n-nodes-base.switch, n8n-nodes-base.httprequest, @n8n/n8n-nodes-langchain.openai, n8n-nodes-base.set, n8n-nodes-base.splitout, @n8n/n8n-nodes-langchain.memorybufferwindow

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Floyd Mahou.

Original n8n.io source

1.1 Workflow description

Title: Auto-generate WhatsApp proposals from voice or text using GPT & APITemplate
Workflow name: Auto-generate WhatsApp proposals from voice or text using GPT & APITemplate

How it works • Transcribes a WhatsApp voice or text message from a prospect using Whisper or GPT • Extracts key information (name, need, context, urgency) via AI • Matches the most relevant service pack by comparing the prospect’s need with Airtable data • Dynamically fills a branded template via APITEMPLATE (HTML or PDF) • Generates a clean, personalized business proposal — including dynamic links (payment, calendar, etc.) • Sends the final PDF back instantly via WhatsApp or email

Set up steps • ⏱ Estimated setup time: 45–60 minutes • ✅ You’ll need: ◦ WhatsApp Business Cloud API access (with webhook configured) ◦ OpenAI API key (Whisper + GPT) ◦ Airtable (to store service packs and client input) ◦ APITEMPLATE account (template with placeholders like {{nom}}, {{prix}}, {{lien_reservation}}, etc.) ◦ n8n instance (cloud or self-hosted)

• 📦 Create your service packs in Airtable with associated links (Stripe, Calendly…) • 🔗 The proposal auto-includes these links dynamically inside the PDF • 🚀 Workflow orchestrates the end-to-end process: from WhatsApp input to PDF delivery

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - OpenAI Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 2 - WhatsApp Trigger

Type / Role: n8n-nodes-base.whatsAppTrigger - whatsAppTrigger
Config choices: Version 1

Block 3 - Switch

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3.2

Block 4 - HTTP Request

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 5 - OpenAI

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 1.8

Block 6 - Edit Fields

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 7 - Split Out

Type / Role: n8n-nodes-base.splitOut - splitOut
Config choices: Version 1

Block 8 - Edit Fields1

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 9 - Simple Memory

Type / Role: @n8n/n8n-nodes-langchain.memoryBufferWindow - memoryBufferWindow
Config choices: Version 1.3

Block 10 - WhatsApp Business Cloud

Type / Role: n8n-nodes-base.whatsApp - whatsApp
Config choices: Version 1

Block 11 - Calculator

Type / Role: @n8n/n8n-nodes-langchain.toolCalculator - toolCalculator
Config choices: Version 1

Block 12 - Get Info

Type / Role: n8n-nodes-base.airtableTool - airtableTool
Config choices: Version 2.1

Block 13 - AI Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 1.8

Block 14 - APITemplate.io

Type / Role: n8n-nodes-base.apiTemplateIo - apiTemplateIo
Config choices: Version 1

Block 15 - WhatsApp Business Cloud2

Type / Role: n8n-nodes-base.whatsApp - whatsApp
Config choices: Version 1

Block 16 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 17 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 18 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 19 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Auto-generate WhatsApp proposals from voice or text using GPT & APITemplate
Complexity	advanced
Nodes	19
Categories	Lead Nurturing, AI Chatbot
Author	Floyd Mahou
Published	03 Jul 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/5656/5656.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Lead Nurturing workflows AI Chatbot workflows

Frequently asked questions

What does Auto-generate WhatsApp proposals from voice or text using GPT & APITemplate do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Lead Nurturing, AI Chatbot use case.

Floyd Mahou

3 workflows

Nodes

@n8n/n8n-nodes-langchain.lmchatopenai n8n-nodes-base.whatsapptrigger n8n-nodes-base.switch n8n-nodes-base.httprequest @n8n/n8n-nodes-langchain.openai n8n-nodes-base.set n8n-nodes-base.splitout @n8n/n8n-nodes-langchain.memorybufferwindow

Complexity

advanced

Published 03 Jul 2025

Likes 0

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Install path: /data/workflows/5656/5656.json

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Auto-generate WhatsApp proposals from voice or text using GPT & APITemplate

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - OpenAI Chat Model

Block 2 - WhatsApp Trigger

Block 3 - Switch

Block 4 - HTTP Request

Block 5 - OpenAI

Block 6 - Edit Fields

Block 7 - Split Out

Block 8 - Edit Fields1

Block 9 - Simple Memory

Block 10 - WhatsApp Business Cloud

Block 11 - Calculator

Block 12 - Get Info

Block 13 - AI Agent

Block 14 - APITemplate.io

Block 15 - WhatsApp Business Cloud2

Block 16 - Sticky Note

Block 17 - Sticky Note1

Block 18 - Sticky Note2

Block 19 - Sticky Note3

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions