question

Yes. If you want to send and receive “money” as currency among friends(or given players), you can use CloudScript to do it securely, where you can call Server API including Add User Virtual Currency and Subtract User Virtual Currency functions.

Additionally, If you want to send “gift” which is an item, then you can use Trading related functions. For similar information, please refer to this case: Player Gifting another Player?

@Błażej Michacz

If you click the link of “CloudScript” that I mentioned above, you will see CloudScript Functions quickstart guide and CloudScript (Legacy) quickstart, either of which provides a simple guidance of CloudScript for beginners. CloudScript(Legacy) is easier to start. To execute CloudScript(Legacy) methods, you may refer to Executing CloudScript (Legacy) functions from a Unity game client. For further information, please refer to Writing custom CloudScript (Legacy) tutorial.

• "how can I do that you can see from which player the gift comes?"

If you go to “Game Manager” -> “My Game” -> “Automation” -> “Cloud Script” -> “Revisions(legacy)”, you can see there is a variable named “currentPlayerId” inside “handlers.helloWorld”. The pre-defined "currentPlayerId" variable is initialized to the PlayFab ID of the player logged-in on the game client.

Supposing that first Player wants to send gift to second player:

In your client side, you can include a method of “Open Trade” API. Inside “Open Trade” API, you can set the PlayFabId of second player into “AllowedPlayerIds”. Then you can get the “result.Trade.TradeId” from the callback of “Open Trade” API. the first player can call “Execute Cloud Script” Client API to invoke your “Update User Read Only Data” CloudScript function and pass the “PlayFabId of second player” and “tradeId” to CloudScript function’s args. The second player can call “Get User Read Only Data” to get the key-value pairs data of “PlayFabId of the first player” and TradeID. By using “Accept Trade” Client API and set “PlayFabId of the first player” as “OfferingPlayerId” and “traded” as “TradeId”, the second player can accept trade.

In CloudScript side, you may set a handler that contains “Update User Read Only Data” Server API to set read only data for the second player including “currentPlayerId”(which is PlayFabId of the first player) and “TradeId”.