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Standard Transfer Specification (STS)
STS is a standardized protocol that enables different vending systems to vend tokens to any STS compatible
prepayment meter.
Tokens generated using this algorithm can only be used once and must be supplied by an approved
authority. Tokens are meter and area specific, which means that a token can only used on one specific meter
and not on any other. Tokens that are lost or stolen can only be entered into the meter that the token was
generated for. This makes the STS prepayment protocol a very safe and controlled environment.
STS allows the use of equipment from different suppliers. It is a secure procedure that prevents the following:
Duplicate generation of tokens through legitimate vending devices
Fraudulent generation of tokens through stolen vending devices
Duplicate generation of tokens through legitimate vending devices outside the supply authority’s
area
Fraudulent use of previously used tokens
Tampering with legitimate tokens (i.e. changing information)
Token security
There are two different types of dispenser tokens used in the STS protocol. These types are: Dispenser
specific tokens and non-specific tokens.
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