This exists in the Client and Admin APIs, but it'd also be really useful in the Server API for tweaking and modifying sales.
I'd also like this in order to access per-Store CustomData from CloudScript, unless there's some other way to access this from a server method that I'm missing!
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Add 'UpdateEmailAddress' to API -- Currently you have to do this manually
PlayFab validation for rewarded adverts
Allow generate coupon via API (for example, gifting)
Make items more intuitive in terms of accessing certain elements
Optional longer coupon codes when used as a "game key"
Game Key Management - A RedeemCoupon extension + mgmt console