curl --request POST \
  --url https://api.kejue.co/api/v1/contacts/bulk \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "contacts": [
    {
      "phone": "<string>",
      "whatsapp_number": "<string>",
      "email": "<string>",
      "first_name": "<string>",
      "last_name": "<string>",
      "company": "<string>",
      "job_title": "<string>",
      "country": "<string>",
      "timezone": "<string>",
      "language": "<string>",
      "tags": [
        "<string>"
      ],
      "metadata": {}
    }
  ],
  "skip_duplicates": true,
  "duplicate_field": "phone"
}
'

{
  "created": 123,
  "skipped": 123,
  "errors": [
    {
      "index": 123,
      "error": "<string>"
    }
  ]
}