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List<Invoice> AllInvoices = new List<Invoice>();
List<Invoice> CurrentInvoices = new List<Invoice>();
int i = 1;
CurrentInvoices = _api.Invoices.Page(i).Find().OrderBy(e => e.DueDate).ToList();
while(CurrentInvoices != null)
{
    AllInvoices.AddRange(CurrentInvoices);
    i++;
    CurrentInvoices = _api.Invoices.Page(i).Find().OrderBy(e => e.DueDate).ToList();
}