Verify Zoom webinar registrants before syncing to Mailchimp

1. 1. Zoom registrant created (trigger)

   Read registrant email, first_name, and webinar topic.

2. 2. Verify address with ValidReach (http)

   POST the registrant email to /api/v1/verify/single.

3. 3. Branch on verification status (branch)

   Separate deliverable attendees from invalid/disposable signups.

4. 4. Add subscribed member to Mailchimp audience (action)

   Upsert the contact in Mailchimp with a webinar-verified tag.

5. 5. Exclude from Mailchimp marketing audience (action)

   Do not import invalid or disposable addresses into your billed Mailchimp audience.

• Zoom registrant created → Verify address with ValidReach
• Verify address with ValidReach → Branch on verification status
• Branch on verification status → Add subscribed member to Mailchimp audience (valid)
• Branch on verification status → Exclude from Mailchimp marketing audience (invalid, disposable, catchall, role, unknown)

• ValidReach API key YOUR_API_KEY: Create it under Settings → API keys and store it in your automation tool’s secret storage.
• Zoom & Mailchimp connection CONNECT_YOUR_OWN_ACCOUNT: Connect your Zoom webinar account and Mailchimp audience credentials.

POST https://validreach.dev/api/v1/verify/single
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

{"email":"user@example.com"}

{
  "success": true,
  "data": {
    "email": "user@example.com",
    "status": "valid",
    "is_deliverable": true,
    "reason": "accepted_email",
    "credits_used": 1,
    "retryable": false
  }
}

Event registrations often attract disposable addresses; filtering them before Mailchimp sync prevents both bounce spikes and unnecessary subscriber tier upgrades.

Verification status. Schema: checked in unit tests. Import: not tested on any platform. Sandbox run: not run. The download is this ValidReach definition, not an importable file for an automation platform.