///<summary>Creates patients with billing cycle day. Sets BillingUseBillingCycleDay preference to true. Creates an UpdateHistory
///entry for version 16.1.1.0. Deletes all current repeat charges.</summary>
public Patient CreatePatForRepeatCharge(string suffix, int billingCycleDay)
{
Patient pat = PatientT.CreatePatient(suffix);
Patient patOld = pat.Copy();
pat.BillingCycleDay = billingCycleDay;
Patients.Update(pat, patOld);
PrefT.UpdateBool(PrefName.BillingUseBillingCycleDay, true);
UpdateHistoryT.CreateUpdateHistory("16.1.1.0");
Prefs.RefreshCache();
List <RepeatCharge> listRepeatingCharges = RepeatCharges.Refresh(0).ToList();
listRepeatingCharges.ForEach(x => RepeatCharges.Delete(x));
return(pat);
}