You are helping me build the following AI agent workflow.

## Goal
Capture vCard QR Contacts Into KlickTipp: Scan a business card QR code and automatically add the contact to KlickTipp with Double Opt-In.

## Specification
- What it does: Scan a vCard QR code to instantly add the contact to your KlickTipp list with Double Opt-In enabled. This process automatically captures names, emails, and phone numbers from the scan and updates your subscriber database in real time.
- Trigger: Triggered by an event (Event · on scan webhook)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - AllCodeRelay: Scan vCard QR codes and send payload
  - n8n Webhook: Receive scan data trigger
  - Code: Parse vCard text into contact fields
  - KlickTipp: Add or update subscriber with Double Opt-In

## Known pitfalls, handle each one explicitly in your implementation
1. vCard fields often contain special characters that break JSON parsing, so sanitize all string inputs before sending to n8n.
2. Double Opt-In sends an email immediately upon creation, ensure your sender domain has proper SPF/DKIM records set up.

## Reference implementation
https://n8n.io/workflows/13621 (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/capture-vcard-qr-contacts-into-klicktipp/ via usecasesforagents.com