This article provides a complete, practical walkthrough of the Code Webhook Create Webhook n8n agent. It connects HTTP Request, Webhook across approximately 1 node(s). Expect a Intermediate setup in 15-45 minutes. One‑time purchase: €29.

What This Agent Does

This agent orchestrates a reliable automation between HTTP Request, Webhook, handling triggers, data enrichment, and delivery with guardrails for errors and rate limits.

It streamlines multi‑step processes that would otherwise require manual exports, spreadsheet cleanup, and repeated API requests. By centralizing logic in n8n, it reduces context switching, lowers error rates, and ensures consistent results across teams.

Typical outcomes include faster lead handoffs, automated notifications, accurate data synchronization, and better visibility via execution logs and optional Slack/Email alerts.

How It Works

The workflow uses standard n8n building blocks like Webhook or Schedule triggers, HTTP Request for API calls, and control nodes (IF, Merge, Set) to validate inputs, branch on conditions, and format outputs. Retries and timeouts improve resilience, while credentials keep secrets safe.

Third‑Party Integrations

• HTTP Request
• Webhook

Import and Use in n8n

1. Open n8n and create a new workflow or collection.
2. Choose Import from File or Paste JSON.
3. Paste the JSON below, then click Import.
4. Show n8n JSON

   **Title:**
   Seamless Raw Materials Inventory Management Using n8n, Google Sheets, Supabase & Gmail
   
   **Meta Description:**
   Streamline your raw materials inventory with this powerful n8n workflow. Automate receipt, issue requests, approvals, and low stock alerts using Google Sheets, Supabase, and Gmail—all with zero code.
   
   **Keywords:**
   n8n inventory management, automate stock control, Google Sheets inventory automation, Supabase stock updates, Gmail low stock alerts, raw materials automation, no-code approval workflow, inventory automation template, webhook inventory system, real-time stock tracking
   
   ---
   
   **Article:**
   
   # Seamless Raw Materials Inventory Management Using n8n, Google Sheets, Supabase & Gmail
   
   In fast-paced production environments, managing raw materials manually introduces delays, errors, and miscommunication. Stock shortages, delayed approvals, and inconsistent records can bottleneck your entire supply chain. Fortunately, there’s a better way.
   
   This article showcases a robust n8n workflow designed to automate raw material receiving, issue request approvals, inventory tracking, and stock alerting—leveraging the power of Google Sheets, Supabase, and Gmail, all orchestrated through n8n.
   
   Whether you're a manufacturing startup or a mid-sized enterprise juggling raw materials, this workflow streamlines your operations with a no-code, modular approach.
   
   ---
   
   ## Why Automate Inventory Management?
   
   Manual inventory management methods—like spreadsheets, emails, and verbal approvals—are prone to human errors. This workflow eliminates that friction by:
   
   - Validating stock data in real time,
   - Automating record-keeping across tools,
   - Sending approval and rejection emails with actionable buttons,
   - Detecting and alerting low stock conditions instantly.
   
   ---
   
   ## Workflow Overview
   
   This n8n automation is divided into two core flows:
   
   ### 1. Raw Material Receiving & Stock Update
   
   When new materials arrive:
   
   - 📥 A webhook receives structured material data (e.g., Product ID, Quantity Received, etc.)—usually from a Google Form or any custom form.
   - 🔍 The data is validated and formatted.
   - 💰 A total price is calculated (Quantity x Unit Price).
   - 📄 The record is appended to a “Raw Materials” Google Sheet and optionally added to a Supabase table for structured backend storage.
   - 📦 Existing stock is looked up to determine whether to update or initialize inventory.
   - 🧮 Current stock is updated in both Google Sheets and Supabase tables.
   - 🚨 If stock falls below a defined minimum level, a beautiful HTML email alert is sent to the stock manager, prompting a reorder.
   
   ### 2. Material Issue Request & Approval
   
   When someone requests materials for production:
   
   - 🌐 An HTTP webhook captures the request (Product ID, Quantity Requested, Requested By, etc.).
   - 🧾 The workflow standardizes inputs and adds a dynamic approval link.
   - 📄 The request is recorded in a “Materials Issued” Sheet and Supabase DB.
   - ✅ The current stock is checked to see if the issue request can be fulfilled.
   - 📧 An automated email is sent to the approver with buttons to "Approve" or "Reject" the request.
   - ☑️ The approver’s decision is captured via a webhook click link that’s parsed and normalized.
   - ✅ If approved, the specified amount is deducted from current stock and both databases and Sheets are updated.
   - 📉 If post-issuance stock falls below the minimum threshold, another alert email is sent.
   - ❌ If rejected, the status is updated without affecting stock levels.
   
   ---
   
   ## Benefits
   
   ✅ Saves Time: Replaces manual data entry and email-based approvals.
   
   ✅ Error Reduction: Built-in validations confirm quantities, ID consistency, and stock sufficiency.
   
   ✅ Real-Time Alerts: Automated low-stock and approval-rejection alerts keep stakeholders informed.
   
   ✅ Easy Integration with Existing Tools: Syncs with Google Sheets and Supabase—no need for expensive ERP systems.
   
   ✅ Fully Customizable: You can adapt fields, rules, and alert logic to suit your operational needs.
   
   ---
   
   ## Key Features at a Glance
   
   | Feature                      | Description |
   |-----------------------------|-------------|
   | Webhook Integration         | Handles material submissions and issue requests. |
   | Data Standardization        | Ensures consistent formatting across inputs. |
   | Stock Calculations          | Realtime additions and subtractions, including alerts. |
   | Approval Workflow           | Email-based interactions with status tracking. |
   | Low Stock Alerts            | Auto-email alerts to prevent stockouts. |
   | Backend Support             | Uses Google Sheets for transparency and Supabase for structured data management. |
   
   ---
   
   ## Third-Party Services & APIs Used
   
   | Service         | Purpose |
   |----------------|---------|
   | 🧾 Google Sheets API | Logs incoming materials and outgoing issues; Updates current stock in real-time. |
   | 🚨 Gmail API         | Sends HTML approval emails and low stock alerts to designated recipients. |
   | 🧱 Supabase API      | Maintains structured inventory records, raw materials received, and issued materials. |
   | 🌐 n8n Webhooks      | Receives and handles HTTP requests for materials receipt and approvals. |
   
   ---
   
   ## Final Words
   
   This n8n-based inventory workflow is a game-changer for teams still managing their raw materials manually. It’s easy to extend, customize, and deploy—without writing backend infrastructure or investing in full-blown ERP systems.
   
   Get started today with this workflow to make your warehousing smarter, faster, and error-free. Happy automating!
   
   ---
   
   If you need help setting up this workflow, join the [n8n community](https://community.n8n.io) or explore tutorials at [docs.n8n.io](https://docs.n8n.io).

5. Set credentials for each API node (keys, OAuth) in Credentials.
6. Run a test via Execute Workflow. Inspect Run Data, then adjust parameters.
7. Enable the workflow to run on schedule, webhook, or triggers as configured.

Tips: keep secrets in credentials, add retries and timeouts on HTTP nodes, implement error notifications, and paginate large API fetches.

Validation: use IF/Code nodes to sanitize inputs and guard against empty payloads.

Why Automate This with AI Agents

AI‑assisted automations offload repetitive, error‑prone tasks to a predictable workflow. Instead of manual copy‑paste and ad‑hoc scripts, your team gets a governed pipeline with versioned state, auditability, and observable runs.

n8n’s node graph makes data flow transparent while AI‑powered enrichment (classification, extraction, summarization) boosts throughput and consistency. Teams reclaim time, reduce operational costs, and standardize best practices without sacrificing flexibility.

Compared to one‑off integrations, an AI agent is easier to extend: swap APIs, add filters, or bolt on notifications without rewriting everything. You get reliability, control, and a faster path from idea to production.

Best Practices

• Credentials: restrict scopes and rotate tokens regularly.
• Resilience: configure retries, timeouts, and backoff for API nodes.
• Data Quality: validate inputs; normalize fields early to reduce downstream branching.
• Performance: batch records and paginate for large datasets.
• Observability: add failure alerts (Email/Slack) and persistent logs for auditing.
• Security: avoid sensitive data in logs; use environment variables and n8n credentials.

FAQs

Can I swap integrations later? Yes. Replace or add nodes and re‑map fields without rebuilding the whole flow.

How do I monitor failures? Use Execution logs and add notifications on the Error Trigger path.

Does it scale? Use queues, batching, and sub‑workflows to split responsibilities and control load.

Is my data safe? Keep secrets in Credentials, restrict token scopes, and review access logs.