Generate Google Ad Copy Automatically with Claude 3.5, Channable & Relevance AI

Description

🚀 Channable + Google Ads + Relevance AI: Scalable AI Workflow for Automated Ad Copy Generation & Publishing

🧩 Overview

This workflow automates the entire ad creation process for Google Ads by integrating product data, AI-generated copy, compliance checks, and publication into your marketing pipeline.

It connects n8n, Relevance AI, Google Sheets, and optionally Channable to:

Fetch product data from your catalog
Generate Google Text Ad headlines and descriptions using Relevance AI
Validate character limits and ensure Google Ads compliance
Route non-compliant ads to a Slack review channel
Save compliant, ready-to-publish ads in Google Sheets
Notify your marketing team automatically after each generation cycle

🧠 Key Benefits

✅ 100% automated ad copy pipeline
✅ AI-generated, human-quality Google Ads text
✅ Built-in compliance verification (Google Ads policy)
✅ Google Sheet integration for team review
✅ Daily automatic schedule (zero manual effort)
✅ Slack alerts for QA and transparency
✅ Modular design — extendable for Shopping and Performance Optimization
✅ Scalable for 10 → 10,000+ product ads

⚙️ System Architecture

Tech Stack

n8n** – Automation Orchestrator
Relevance AI** – AI tools for copy generation and policy compliance
Google Sheets** – Data storage and team collaboration
Slack** – Real-time alerts and notifications
(Optional) Channable – Product feed integration

🧭 Workflow Logic

Daily Trigger (00:00)
⬇️
1️⃣ Get Product Feed (Channable or custom API)
⬇️
2️⃣ Split Into Batches (50 products each)
⬇️
3️⃣ Generate Ad Copy (Relevance AI tool → Claude 3.5 prompt)
⬇️
4️⃣ Validate Character Limits (JS node: max 30 headline / 90 description)
⬇️
5️⃣ Compliance Check (Relevance AI agent → Google Ads policies)
⬇️
6️⃣ IF Compliant → CSV / Google Sheets
↳ ❌ Non-Compliant → Slack Alert
⬇️
7️⃣ Aggregate Batches + Generate CSV
⬇️
8️⃣ Save to Google Sheets (“Generated Ads” tab)
⬇️
9️⃣ Slack Notification → Summary Report

📋 Environment Variables

Set these in n8n → Settings → Variables → Add Variable

Copy-paste from your ENVIRONMENT_VARIABLES_CORRECTED.txt.

Includes:

✅ Relevance AI region, API key, tool & agent IDs
✅ Google Ads, Merchant Center, and Sheets credentials
✅ Slack channel name
✅ Optional Channable endpoint

Example:

RELEVANCE_AI_API_URL=https://api-f1db6c.stack.tryrelevance.com/latest
RELEVANCE_TOOL_AD_COPY_ID=bueQG8io04dw
RELEVANCE_AGENT_COMPLIANCE_ID=xT29mQ4QKsl
GOOGLE_SHEET_ID=1q2w3e4r5t6y7u8i9o0p
SLACK_CHANNEL=#google-ads-automation

🏗️ Node-by-Node Breakdown

| Node | Description | Endpoint / Logic |
| -------------------------------------- | ----------------------------------------------- | ----------------------------------------------------------------------------- |
| 🕓 Schedule Trigger | Runs daily at 00:00 | Cron 0 0 * * * |
| 📦 Get Product Feed | Pulls product data from Channable or custom API | GET {{$env.CHANNABLE_API_URL}}/v1/projects/{{$env.PROJECT_ID}}/items |
| 🧮 Split Into Batches | Processes 50 products at a time | Avoids rate limits |
| ✍️ Generate Ad Copy (Relevance AI) | Calls AI tool for each product | POST {{$env.RELEVANCE_AI_API_URL}}/tools/google_text_ad_copy_generator/run |
| 🔍 Validate Character Limits | JS validation (≤30 headline / ≤90 description) | Truncates smartly |
| 🧠 Compliance Check Agent | Verifies Google Ads compliance | POST {{$env.RELEVANCE_AI_API_URL}}/agents/google_ads_compliance_checker/run |
| ⚖️ IF Compliant | Routes APPROVED vs REJECTED | "contains 'APPROVED'" |
| 💾 Format for CSV | Formats compliant ads for export | Maps ID, headline, desc, URLs |
| 📊 Aggregate Batches | Combines all results | Merges datasets |
| 🧱 Generate CSV File | Converts JSON → CSV | Escaped string-safe format |
| 📑 Save to Google Sheets | Saves reviewed ads | Sheet: Generated Ads |
| 📢 Slack Notification (Success) | Posts completion summary | Shows ad count, timestamp |
| 🚨 Slack Alert (Non-Compliant) | Notifies team for review | Includes issues, category |

🔑 API Authentication Setup

🔹 Relevance AI

Create “HTTP Header Auth” credential

Header Name: Authorization
Header Value: Bearer {{$env.RELEVANCE_AI_API_KEY}}
🔹 Google Sheets

Credential type: “Google OAuth2 API”
Scopes:

https://www.googleapis.com/auth/spreadsheets
https://www.googleapis.com/auth/drive.file
🔹 Slack

Create Slack App → Add Bot Token Scopes → chat:write
Paste token in n8n “Slack API” credential.

🔹 (Optional) Channable

Header Auth:

Bearer {{$env.CHANNABLE_API_TOKEN}}
🧩 Google Sheet Template

Sheet name: Generated Ads

Columns:

| product_id | headline | description | final_url | display_url | generated_at |

Optional: Add compliance_status or notes columns for QA.

⚙️ Testing Procedure

Manual Trigger: Disable the schedule → click “Execute Workflow”.
Batch Size: Start small (3 products).
Expected Output:

✅ Ad copy generated
✅ Character limits validated
✅ Slack alerts for rejects
✅ Google Sheet filled

Check logs in Executions for errors.
Re-enable the cron trigger after successful validation.

🧾 Example Output

| product_id | headline | description | final_url | display_url | generated_at |
| ---------- | ------------------ | --------------------------------------------- | ------------------------------------------------ | ----------- | -------------------- |
| 12243 | “Eco Bamboo Socks” | “Soft, breathable comfort for everyday wear.” | https://shop.com/socks | shop.com | 2025-10-22T00:00:00Z |

📬 Slack Alert Templates

✅ Success Notification

✅ Google Ads Generation Complete

📊 Summary:
• Total Ads Generated: 50
• Saved to Google Sheets: Generated Ads
• Timestamp: 2025-10-22T00:00:00Z

⚠️ Non-Compliant Alert

⚠️ Non-Compliant Ad Flagged

Product: Bamboo Socks
Issues:
Contains “Free Shipping”
Headline too long

Timestamp: 2025-10-22T00:00:00Z

🧰 Maintenance & Monitoring

| Frequency | Task |
| --------- | -------------------------------- |
| Daily | Check Slack alerts for rejects |
| Weekly | Review ad performance metrics |
| Monthly | Update Relevance AI prompts |
| Quarterly | Refresh API tokens and variables |

📊 Success Metrics

✅ Compliance approval rate: >85%
🚫 Disapproval rate: <5%
📈 CTR improvement: +15–25%
⏱️ Time saved: 10–15 hours/week
🌐 Scalable: 1,000+ ads/day

🪜 Next Steps

Deploy and monitor for 7 days.
After 30 days → activate Workflow 2: Performance Optimization Loop.
Extend to Shopping Feed Optimization.
Add multi-language generation using Relevance AI.
Integrate Google Ads API publishing (full automation).

🔗 Resources

n8n Docs
Relevance AI Docs
Google Ads API
Merchant API
Channable Help

🎉 Conclusion

You now have a production-ready, scalable AI-powered ad generation system integrating
Channable, Google Ads, and Relevance AI — built entirely on n8n.

This delivers:

💡 AI creativity at scale
✅ Google Ads policy compliance
⚙️ Hands-free daily automation
📊 Transparent reporting and collaboration

> Start small → validate → scale to 10,000+ ads per day.
> Within weeks, you’ll have a self-learning, always-on ad pipeline driving consistent performance.