You are helping me build the following AI agent workflow.

## Goal
Order Processing with Google Sheets and Slack: Receives orders via webhook, validates details against inventory, logs to Google Sheets.

## Specification
- What it does: Receive incoming orders instantly via webhook while the system automatically validates details against your inventory levels. It logs every transaction to Google Sheets for easy tracking and sends immediate Slack notifications so you are alerted right away when an order succeeds or stock runs out.
- Trigger: Triggered by an event (Event · on new order webhook)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - Webhook: Receiving incoming order data via API
  - Google Sheets: Logging process details and tracking inventory
  - Slack: Sending alerts to managers about stock status

## Known pitfalls, handle each one explicitly in your implementation
1. Google Sheets API quotas can be exceeded during high traffic so implement request throttling.
2. Slack message formatting breaks if special characters are not escaped properly so sanitize all input strings before sending.
3. Webhook signatures must be verified to prevent unauthorized order submissions from spoofed sources.
4. Inventory checks may race against concurrent requests so use row locking or atomic updates in the sheet.

## Reference implementation
https://n8n.io/workflows/10899 (workflow template)
Fetch and inspect this before building. If it matches my stack, adapt it;
if not, rebuild the pattern with my tools.

## Process requirements
1. Before building: ask me which of the listed tools I actually use and
   what my platform is (n8n / Make / code / other). Do not assume.
2. Adapt the pattern to my answers; do not force the reference stack.
3. Address every pitfall above; tell me how you handled each.
4. Provide a test plan I can run before letting this touch real data.
5. Ask before any step that sends messages, modifies data, or spends money.

Source: https://usecasesforagents.com/use-case/order-processing-with-google-sheets-and-slack/ via usecasesforagents.com