Questions from a developer:
I want players to be able to keep or give away items they gain from in-game actions. Two questions:
1. While I see that the Client API has a GetUserInventory call, how do I add items to the player's inventory from the Unity game?
2. To share items with friends, should I set up a trading system as described here? https://playfab.com/blog/wanna-buy-a-duck-how-to-set-up-trading-in-your-game/
For 1, you should add the items to the player's inventory in Cloud Script, using the Server API method https://api.playfab.com/Documentation/Server/method/GrantItemsToUser?. That provides a server-authoritative means to add items to the player, so that you can have checks in your script to prevent cheating.
For 2, yes, to share items with another player, your best bet is to use the trading API methods, as described in that blog post. That system is designed to insure that there can't be item duplication due to simultaneous requests, and that items can't be "lost" due to a dropped packet in the process.
