curl --request DELETE \
  --url https://integration.getmateo.com/api/v1/marketing_subscription \
  --header 'Authorization: Bearer <token>'

{
  "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "marketing_channel_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organisation_id": "random uuid",
  "created_at": "now()",
  "updated_at": "now()",
  "key": "<string>",
  "status": "requested",
  "channel_type": "email"
}