The maximum quantity limit is a feature implemented by many games by default. I think it's a feature that Playfab should have.
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Request WeChat login integration
ClientAPI for changing DisplayName of inventory ItemInstances
Adding admin API Get User Account Info with Custom ID
Throttle errors to return the time remaining, or the specific limit reached
Ad Placements dashboard: Show PlacementId & RewardId
REST API feature to be provided
Updating PlayFab API for Unreal Engine
Steam Account Linking from website