public static IAsyncEnumerable <IAccountActivity> ListAccountActivitiesAsAsyncEnumerable(
     this IAlpacaTradingClient client,
     AccountActivitiesRequest request,
     CancellationToken cancellationToken) =>
 getAllAccountActivitiesPages(client.EnsureNotNull(nameof(client)),
                              getRequestWithoutPageToken(request.EnsureNotNull(nameof(request))), cancellationToken);
 private static AccountActivitiesRequest getRequestWithoutPageToken(
     AccountActivitiesRequest request) =>
 public static IAsyncEnumerable <IAccountActivity> ListAccountActivitiesAsAsyncEnumerable(
     this IAlpacaTradingClient client,
     AccountActivitiesRequest request) =>
 ListAccountActivitiesAsAsyncEnumerable(client, request, CancellationToken.None);