If only a single piece of scrip is used, the governing secret is the associated customer secret . Each four bits is represented by its familiar hexadecimal notation from the characters 0123456789abcdef . These include the request and reply authorizations , customer secrets , and new customer secrets . The governing secret and body-checksum calculations are made using a straight MD5 algorithm. A server may spontaneously return scrip in the reply to a non-MilliCent request.
Currency codes are case insensitive.
One and two letter codes appearing in the place of a country code are reserved for future use. Canadian, one eighth of a US dollar and 1700 Lira. The certification technique is private to the vendor, the customer just passes back the string it receives with the item. The format is modeled after an HTTP GET query request from a form. This address allows customers to manipulate pieces of scrip.