You are helping me build the following AI agent workflow.

## Goal
Restaurant POS Orders and Inventory: Captures POS orders, processes payments, updates stock levels, and logs sales to Google Sheets in real time.

## Specification
- What it does: Streamline your restaurant operations by automatically capturing orders, processing payments, and updating stock levels without manual entry. You get real-time sales reports in Google Sheets and accurate inventory tracking that prevents overselling while you focus on serving customers.
- Trigger: Triggered by an event (Event · on new order from POS)
- Autonomy: Fully hands-off
- Expected setup effort: a few focused days
- Tools/services involved:
  - POS System: retrieve order details and payment info
  - Payment Gateway: process transactions securely
  - Inventory Management Tool: update stock levels automatically
  - Google Sheets: generate real-time sales reports
  - OpenAI Chat Model: extract and structure order data

## Known pitfalls, handle each one explicitly in your implementation
1. Currency formatting differences between regions can break parsing, normalize all monetary values to a single format before sending them to the LLM.
2. Inventory updates might race if multiple orders arrive simultaneously, implement a queue or locking mechanism to prevent overselling.

## Reference implementation
https://n8n.io/workflows/3942 (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/automate-restaurant-pos-orders-and-inventory/ via usecasesforagents.com