curl --request POST \
  --url https://api.vambe.me/api/public/email-campaign \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <x-api-key>' \
  --data '
{
  "title": "<string>",
  "email_template_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "email_channel_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "recipients": [
    {
      "to_emails": [
        {
          "email": "jsmith@example.com",
          "name": "<string>"
        }
      ],
      "cc_emails": [
        {
          "email": "jsmith@example.com",
          "name": "<string>"
        }
      ],
      "bcc_emails": [
        {
          "email": "jsmith@example.com",
          "name": "<string>"
        }
      ],
      "variables": {},
      "attachments": [
        "<string>"
      ]
    }
  ]
}
'

{
  "id": "<string>",
  "title": "<string>",
  "email_template_id": "<string>",
  "email_channel_id": "<string>",
  "scheduled_at": "2023-11-07T05:31:56Z",
  "sent_at": "2023-11-07T05:31:56Z",
  "total_recipients": 123,
  "created_at": "2023-11-07T05:31:56Z"
}