Add support for coupons

[calind]

[presslabs-bot]

This issue will be automatically closed on Tue, 17 Jan 2017 due to the lack of activity (comments or updates). Closed issues that remain inactive for a long period of time might also get automatically locked.

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cc: @calind, @pdobrescu, @vtemian

[hanifbirgani]

Is there any progress on this idea?

[bogdanpetrea]

@hanifbirgani: We haven't had sufficient need for coupons yet, but that might change in the future. If you feel comfortable with sharing your use case, please do, as it might be helpful for whoever decides to eventually implement this feature.