curl --request POST \
  --url https://api.gospott.com/candidates/{id}/contact-identifiers \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "contactType": "email",
  "purpose": "personal",
  "identifier": "<string>",
  "isPrimary": true
}
'

{
  "duplicates": [
    {
      "contactType": "email",
      "identifier": "<string>",
      "contactIdentifierId": "<string>",
      "takenBy": {
        "name": "<string>",
        "id": "<string>",
        "type": {}
      }
    }
  ]
}