9 Computer-controlled electronic payment and fuel management system for fuel and convenience retailers; Computer-controlled electronic retail site management for viewing and reporting retail data, providing access to site transaction logs, and monitoring and tracking retail sales; Computer-controlled electronic apparatus for use in transaction processing and financial applications; Computer hardware and devices used for data communications and transmitting data; Computer network interface units, and computers for electronic transfer of data; Computer-controlled electronic apparatus for communicating with data terminals, namely, mobile data terminals, handheld terminals, countertop terminals, portable terminals; Computer-controlled electronic apparatus for communicating with credit card, debit card, loyalty card, magnetic card, smart card and transaction processing terminals for electronic transactions; Computer-controlled electronic apparatus for communicating with computer peripherals and data entry and inquiry terminals for operations management and for processing and transferring credit and debit card transactions, payments and financial data and other data presented thereto; Computer-controlled electronic apparatus for retail management and supply chain optimization and management; Computer-controlled electronic apparatus for use in management and analysis of sales information, inventory and other business data and processes at the front store and back office; Computer-controlled electronic apparatus for controlling a Point of Sale (POS) terminal configuration and parameters, and for collecting and managing data from the POS; Computer-controlled electronic apparatus for use in debit card, credit card, smart card, loyalty card and secure payment transaction processing, financial applications, and electronic transfer of financial data; Computer-controlled electronic apparatus for use in financial, credit card, smart card, debit card, and electronic transaction security, access, and identification services; Computer-controlled electronic apparatus for use in secured transmission of information, namely, credit card details; Computer-controlled electronic apparatus for use in the management and processing of secured transactions over a payment network; Computer-controlled electronic apparatus computer program for management of invoices and payment transactions; Computer-controlled electronic apparatus for management of crediting and cancellation of financial transactions; Computer-controlled electronic apparatus for performing diagnostic, monitoring, troubleshooting and configuration functions on computer networks; Electronic controller for use to access to a computer network