public IObservable <Consent> Get(Seller s) => S.Get(Repo, s);
public IObservable <Consent> Confirm(Seller s) => S.FetchConsent(Sellers, Soap, s);
public IObservable <IEnumerable <TraderaAlias> > List(Guid account) => S.List(Repo, App, Now(), account);
public IObservable <TraderaAlias> Add(Guid account, string traderaAlias) => S.AddTraderaUser(Repo, Soap, App, account, traderaAlias);