curl --request GET \
  --url https://api.vambe.me/api/public/email-campaign/recipients/{id} \
  --header 'x-api-key: <x-api-key>'

{
  "recipients": [
    {
      "id": "<string>",
      "to_emails": [
        {}
      ],
      "cc_emails": [
        {}
      ],
      "bcc_emails": [
        {}
      ],
      "sent_at": "2023-11-07T05:31:56Z",
      "error": "<string>"
    }
  ],
  "total": 123
}