<ContactPreferencesSet>
     <contact_number>12345</contact_number>
     <preferences>
         <statement_printing>1</statement_printing>
         <cash_receipt_printing>1</cash_receipt_printing>
         <invoice_printing>2</invoice_printing>
         <invoice_reprint_printing>3</invoice_reprint_printing>
         <shipment_printing>4</shipment_printing>
     </preferences>
</ContactPreferencesSet>

Your options are:
     1-Normal Printer
     2-Mail Printer
     3-Both Printers
     4-Email
     5-Normal Printer/Email
     6-Mail Printer/Email
     7-Both Printers/Email
     8-Fax
     9-Normal Printer/Fax
    10-Mail Printer/Fax
    11-Both Printers/Fax
    12-Email/Fax
    13-Normail Printer/Email/Fax
    14-Mail Printer/Email/Fax
    15-Everything
    16-Nothing