Promotional Coupon

What is a Promotional Coupon? Is that a coupon that resembles paper money such as..

https://en.numista.com/catalogue/exonumia329627.html

N#217346

Or is it just any coupon that gives money off for anything? 

Like from this web site.

https://www.coupons.com/coupons/

Or the 100's of coupons that are or were in the Sunday papers here in the USA?

Just trying to clarify what my role is and what is acceptable. Not looking for a debate about Paper Exonumia.

Thank You

Jerry

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For me exonumia stops when coupons are not usable in addition with other reduction or else.

Promotional coupons are imo advertising, commercial nudges, not exonumia.