curl --request GET \
  --url https://api.openphone.com/v1/contacts/{id} \
  --header 'Authorization: <api-key>'

{
  "data": {
    "id": "<string>",
    "externalId": "664d0db69fcac7cf2e6ec",
    "source": "public-api",
    "sourceUrl": "https://openphone.co/contacts/664d0db69fcac7cf2e6ec",
    "defaultFields": {
      "company": "OpenPhone",
      "emails": [
        {
          "name": "<string>",
          "value": "[email protected]",
          "id": "<string>"
        }
      ],
      "firstName": "John",
      "lastName": "Doe",
      "phoneNumbers": [
        {
          "name": "<string>",
          "value": "+12345678901",
          "id": "<string>"
        }
      ],
      "role": "Sales"
    },
    "customFields": [
      {
        "name": "<string>",
        "type": "multi-select",
        "value": [
          "<string>"
        ],
        "key": "<string>",
        "id": "<string>"
      }
    ],
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z",
    "createdByUserId": "<string>"
  }
}