curl --request POST \
  --url https://api.getoutbox.ai/workflow/{workflow_id}/enrollments/add/ \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "contact_ids": "<unknown>",
  "filters": "<unknown>",
  "limit": 123,
  "scheduled_at": "<string>",
  "timezone": "<string>"
}
'

{
  "added": 123,
  "skipped": 123,
  "total_matching": 123
}