curl --request GET \
  --url https://api.comm.com/api/v1/sms/campaigns/{campaign}/domains-cost \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "cost": 123,
    "required_domains": 123,
    "max_sms_per_domain": 123,
    "contacts_count": 123
  }
}