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# Check in an event registrant

> Record that a registrant attended, or undo it. Reaches no one. Input schema, a tools/call example and an example result.

Source: https://cotlet.dev/docs/mcp/wild-apricot/check_in_registrant

Docs sections: [Get started](https://cotlet.dev/docs.md) · [REST API](https://cotlet.dev/docs/api.md) · [MCP](https://cotlet.dev/docs/mcp.md) · [SDKs & CLI](https://cotlet.dev/docs/sdks.md) · [Integrations](https://cotlet.dev/docs/integrations.md)

Record that a registrant attended, or undo it. Reaches no one.

Wild Apricot MCP tools: https://cotlet.dev/docs/mcp/wild-apricot.md

MCP tool: `wild_apricot_write → check_in_registrant`

Access: write.

Clicks the Check in circle beside the registrant in Registrants & invitees. guests sets how many of a registration's guests are checked in. A registrant with an unpaid registration is not checked in unless check_in_unpaid is true. Only full administrators and event managers can check in. It sends nothing and is undone by calling it again with checked_in false, so it does not wait for your OK.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `registration_id` | integer | yes | Registration ID from list_event_registrants. |
| `checked_in` | boolean | no | false undoes a check-in. Default: true. |
| `guests` | integer | no | Number of guests to check in with this registration. Default: 0. |
| `check_in_unpaid` | boolean | no | Check in a registrant who has not fully paid. Default: false. |

## tools/call

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "wild_apricot_write",
    "arguments": {
      "operation": "check_in_registrant",
      "arguments": {
        "registration_id": 1
      }
    }
  }
}
```

## Example response

```json
{
  "content": [
    {
      "type": "text",
      "text": "{ ... same JSON as structuredContent ... }"
    }
  ],
  "structuredContent": {
    "registration_id": 553104,
    "name": "Lena Ortiz",
    "checked_in": true,
    "guests_checked_in": 1,
    "paid": true
  },
  "isError": false
}
```

Previous: [Reject a membership application](https://cotlet.dev/docs/mcp/wild-apricot/reject_membership_application.md)
Next: [Send an email](https://cotlet.dev/docs/mcp/wild-apricot/send_email.md)

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