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A term used within the card industry to refer to a transaction using a chip and PIN card that was not handled by the merchant using the EMV standard process. In such cases the transaction would normally be processed using the card details held in the magnetic stripe with the cardholder signing the receipt. These transactions are undertaken at the merchant’s own risk.
A firewall is designed to permit or deny network transmissions based upon a set of pre-defined rules. It is frequently used to protect networks from unauthorized access whilst permitting legitimate communications to pass.
Fleet card
See Fuel card.
Floor limit
A limit on the value of each transaction agreed between the merchant and acquirer above which authorisation must be obtained by the merchant from the card issuer.
Foreign issued cards
A card issued by a non-UK card issuer.  Cards issued in some countries may not be chip and PIN compliant and will need to be processed using the magnetic stripe on the reverse of the card.
Forensic signature
This is a record of the data elements from the card that are used to complete a transaction.
Fraud screening
Fraud screening forms part of a transaction’s authorisation process flow and is conducted prior to authorisation to help reduce fraud and prevent chargebacks. 
Fraudulent transaction
A fraudulent transaction is one unauthorised by the cardholder. For more information please see
Fuel card
Fuel or fleet cards are sector specific cards that can be used to buy automotive related items. Typically these are issued to a company’s sales representatives or transport distribution drivers. The company can access management information on fuel purchases made by their employees.
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