Coupon system
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This module is currently under design stage. For your information I've included a summary of module purposes.
A coupon is a digital representation of the right to claim goods, promotion or services. The usage of coupons is defined as "voucher". To clarify workflow and terminology, let I be a voucher issuer, H be a voucher holder, P be the issuer's 'promise' to the voucher holder. A voucher is defined as the 3-tuple of [ I (issuer), P (promise), H (holder) ].
