curl --request GET \
  --url https://api.kejue.co/api/v1/contacts/{contact_id} \
  --header 'X-API-Key: <api-key>'

{
  "id": "<string>",
  "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": {},
  "source": "<string>",
  "is_active": true,
  "created_at": "<string>",
  "updated_at": "<string>"
}