code: def modify_customer(self, handle, address, phone, email=None, vat=None, fax=None,
                          company_name=None, additional_data=None, extension_additional_data=None):
          
  
          self.request(E.modifyCustomerRequest(
              E.handle(handle),
              E.vat(vat or ''),
              _get_phone_xml('phone', phone),
              _get_phone_xml('fax', fax),
              E.address(
                  E.street(address.street),
                  E.number(address.number),
                  E.suffix(address.suffix or ''),
                  E.zipcode(address.zipcode),
                  E.city(address.city),
                  E.state(address.state or ''),
                  E.country(address.country),
              ),
              E.email(email or ''),
              _additional_data(additional_data),
              _extension_additional_data(extension_additional_data),
          ))
  
          return True
docs: Modify a customer.