curl --request POST \
  --url https://api.heyy.io/api/v2.0/{channelId}/whatsapp_messages/send \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "phoneNumber": "<string>",
  "type": "TEMPLATE",
  "messageTemplateId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "fileId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "variables": [
    {
      "name": "<string>",
      "value": "<string>"
    }
  ],
  "scheduledAt": "2023-11-07T05:31:56Z"
}
'

{
  "data": {
    "id": "<string>",
    "phoneNumber": "<string>",
    "status": "<string>",
    "createdAt": "<string>",
    "message": "<unknown>"
  }
}