Providing a secure electronic online system featuring technology which allows vendors to submit electronic invoices to sales representative agencies for importing and processing of electronic invoices to save time and improve accuracy; Providing temporary use of non-downloadable computer software for preparing invoices over computer networks, intranets and the internet; Providing temporary use of on-line non-downloadable software for preparing and processing invoices and payment reminders; Software as a service (SAAS) services featuring software for preparing and processing invoices and payment reminders