curl --request DELETE \
  --url https://api.jetemail.com/outbound/transactional-keys \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "api_token": "transactional_a1b2c3d4"
}
'

{
  "success": true,
  "message": "Transactional key deleted successfully"
}