@misc{rfc3506,
    series =    {Request for Comments},
    number =    3506,
    howpublished =  {RFC 3506},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC3506},
    url =       {https://www.rfc-editor.org/info/rfc3506},
    author =    {Donald E. Eastlake 3rd and Ko Fujimura},
    title =     {{Requirements and Design for Voucher Trading System (VTS)}},
    pagetotal = 15,
    year =      2003,
    month =     mar,
    abstract =  {Crediting loyalty points and collecting digital coupons or gift certificates are common functions in purchasing and trading transactions. These activities can be generalized using the concept of a "voucher", which is a digital representation of the right to claim goods or services. This document presents a Voucher Trading System (VTS) that circulates vouchers securely and its terminology; it lists design principles and requirements for VTS and the Generic Voucher Language (GVL), with which diverse types of vouchers can be described. This memo provides information for the Internet community.},
}