## Set AI Security for Apps Custom Topics

**put** `/zones/{zone_id}/ai-security/custom-topics`

Set the AI Security for Apps custom topic categories for a zone.

A maximum of 20 custom topics can be configured per zone.
Each topic label must be 2–20 characters using only lowercase letters (a–z), digits (0–9), and hyphens.
Each topic description must be 2–50 printable ASCII characters.

Changes can take up to a minute to propagate to the zone.

### Path Parameters

- `zone_id: string`

  Defines the zone.

### Body Parameters

- `topics: optional array of object { label, topic }`

  Custom topic categories for AI Security for Apps content detection.

  - `label: string`

    Unique label identifier. Must contain only lowercase letters (a–z), digits (0–9), and hyphens.

  - `topic: string`

    Description of the topic category. Must contain only printable ASCII characters.

### Returns

- `errors: array of ResponseInfo`

  - `code: number`

  - `message: string`

  - `documentation_url: optional string`

  - `source: optional object { pointer }`

    - `pointer: optional string`

- `messages: array of ResponseInfo`

  - `code: number`

  - `message: string`

  - `documentation_url: optional string`

  - `source: optional object { pointer }`

- `result: object { topics }`

  - `topics: optional array of object { label, topic }`

    Custom topic categories for AI Security for Apps content detection.

    - `label: string`

      Unique label identifier. Must contain only lowercase letters (a–z), digits (0–9), and hyphens.

    - `topic: string`

      Description of the topic category. Must contain only printable ASCII characters.

- `success: true`

  Defines whether the API call was successful.

  - `true`

### Example

```http
curl https://api.cloudflare.com/client/v4/zones/$ZONE_ID/ai-security/custom-topics \
    -X PUT \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
    -d '{}'
```

#### Response

```json
{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "result": {
    "topics": [
      {
        "label": "credit-cards",
        "topic": "credit card numbers"
      }
    ]
  },
  "success": true
}
```