Is it possible to prevent players from buying more than a fixed amount of an item? We're building a game where players buy characters (similar to League of Legends), and we'd never want a situation where they accidentally buy the same character twice. The UI won't allow it, but we'd like enforcement of this on the server too.
Not currently, no. The way you would normally handle this is by simply not presenting the player with the option to purchase the item, as you describe. If this is a feature you'd like to see (specifically, blocking re-purchase of an item using virtual currency - given that we can't prevent purchases on iTunes, Google Play, etc., I'm assuming that's the intent), I'd recommend posting it to our Feature Requests forum.
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