curl --request POST \
  --url https://api.sentvia.ai/v1/domains/{id}/dmarc \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{}'

{
  "hostname": "<string>",
  "dmarc_policy": "<string>",
  "record": {
    "name": "<string>",
    "content": "<string>",
    "purpose": "<string>",
    "priority": 123
  }
}