You are helping me build the following AI agent workflow.

## Goal
Sync Zoom Webinar Attendees to Mailchimp: Syncs Zoom webinar registrants to Mailchimp by filtering internal emails, checking for duplicates, and sending double opt-in confirmations.

## Specification
- What it does: You automatically move Zoom webinar registrants into your Mailchimp audience while filtering out internal emails and preventing duplicates. New contacts receive double opt-in confirmations to keep your list clean, and you can trigger this sync manually or on a schedule.
- Trigger: Run manually (Manual · on demand)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - Zoom API: Retrieve webinar registrant data
  - Mailchimp: Manage contacts and send double opt-in emails
  - Code Node: Extract emails and hash data for processing

## Known pitfalls, handle each one explicitly in your implementation
1. Mailchimp double opt-in requires the user to click a link before they are active, so ensure your downstream workflows wait for the 'subscribed' status rather than just 'pending'.
2. Internal email filtering might accidentally block legitimate partners if you use overly broad domain matches, so verify your exclusion list includes only exact internal domains.

## Reference implementation
https://n8n.io/workflows/11593 (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/sync-zoom-webinar-attendees-to-mailchimp/ via usecasesforagents.com