You are helping me build the following AI agent workflow.

## Goal
QR Code Generator via Webhook: Send text or URLs via webhook to instantly generate QR code images for marketing, events, or internal tools.

## Specification
- What it does: Send text or URLs via an n8n webhook to instantly generate QR code images using the QR Server API. You receive the ready-to-use image directly in the response for immediate marketing, events, or internal tool integration.
- Trigger: Triggered by an event (Event · on webhook POST request)
- Autonomy: Fully hands-off
- Expected setup effort: under an hour
- Tools/services involved:
  - n8n: Workflow orchestration and automation platform
  - HTTP Request: Sending requests to the QR code API

## Known pitfalls, handle each one explicitly in your implementation
1. The QR Server API may have strict size limits for input data so you must truncate long URLs before sending them.
2. Binary image responses require setting the correct content-type header in the final response node to ensure browsers render it correctly.
3. CORS policies might block direct browser requests if testing locally so verify the webhook URL is accessible from your test environment.

## Reference implementation
https://n8n.io/workflows/4596 (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/qr-code-generator-via-webhook/ via usecasesforagents.com