the next monthiy service fee shall be due and payable in advance within the 1st day of every calendar month provided that if any scheduled date for payment is not a business day,payment shall be made on the preceding business day. Payment shall be made in clear funds by banker' draft or cheque or transfer of funds for same day value to such account as shall have been notified in writting to the Tenanth by the Service Provider. The Monthly Service fee shall be due and payable without the Service Provider being required to formally demand payment or issue any reminder or invoice in respect thereof.