Add PurchaseItem to the Server API

My problem: I want to make some checks before letting the user purchase an item from a Store.

For instance, having an item with limit dates (purchaseable only between a startDate and an endDate), or having a limit number of purchases per user for an item.

To be able to do this, I'd need to make those checks through a CloudScript function and, once validated, call PurchaseItem from there.

Unfortunately, PlayFab's Server API doesn't allow to call PurchaseItem from CloudScript, and I think it would be a very helpful feature in many different situations as those described above.

Also, if anyone has a suggestion for a suitable workaround it would be greatly appreciated.

Thank you!