# Request Fields

Send an `application/json` body to `POST /api/v1/phone/active`.

| Field | Type | Required | Validation |
| --- | --- | --- | --- |
| `transaction_id` | string | Yes | 1–36 alphanumeric or hyphen characters; unique for the merchant request. |
| `msisdn` | string | Yes | 7–15 digits in normalized international format; must be a Telkomsel number. |
| `channel` | string | Yes | 1–100 alphanumeric or hyphen characters. |

Example:

```json
{
    "transaction_id": "active-v1-001",
    "msisdn": "628111234567",
    "channel": "web"
}
```