curl --request PUT \
  --url https://api.artu.ai/contact-methods/batch/external \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Environment: <api-key>' \
  --data '
{
  "items": [
    {
      "clientId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "value": "<string>",
      "isPrimary": false,
      "label": "<string>",
      "externalId": "<string>",
      "metadata": {}
    }
  ],
  "atomic": true
}
'

{
  "atomic": "<unknown>",
  "data": [
    {
      "data": {
        "clientId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "value": "<string>",
        "isVerified": true,
        "verifiedAt": "2023-11-07T05:31:56Z",
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "createdAt": "2023-11-07T05:31:56Z",
        "updatedAt": "2023-11-07T05:31:56Z",
        "isPrimary": false,
        "label": "<string>",
        "externalId": "<string>",
        "metadata": {}
      }
    }
  ]
}