Generate Google ad copy automatically with Claude 3.5, Channable & Relevance AI

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

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🧩 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

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🧠 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

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⚙️ 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

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🧭 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

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📋 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

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🏗️ 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

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🔑 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}}
  

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🧩 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.

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⚙️ Testing Procedure

1. Manual Trigger: Disable the schedule → click “Execute Workflow”.

2. Batch Size: Start small (3 products).

3. 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.

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🧾 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

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📬 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

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🧰 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

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📊 Success Metrics

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

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🪜 Next Steps

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

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🔗 Resources

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

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🎉 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.

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