> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.simz.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.simz.com/_mcp/server.

# Custom Data

> Attach client-defined metadata to leads and webhook payloads.

Use `customData` to pass your own lead metadata through SimZ workflows. SimZ preserves your keys without reshaping them.

## Example

```json
{
  "phoneNumber": "+15551234567",
  "firstName": "Jane",
  "customData": {
    "leadId": "LEAD-001",
    "campaignTag": "spring-2026",
    "crmOwner": "sales-team-a"
  }
}
```

## Webhook behavior

When available, SimZ includes this data in webhook payloads at `lead.customData`.