question

May I know why you want to set a virtual currency equal to a player statistics, and vice versa?

Now, to answer your question: How can i set a virtual currency equal to a player statistics in a cloudscript?

1. Use GetPlayerStatistics to retrieve the value of a specific statistic.
2. Use GetUserInventory to get the player’s current VC amount.
3. Compare the VC value and the Statistic value, if the VC value is greater than the Statistic value, use SubtractUserVirtualCurrency to subtract the difference, otherwise, use AddUserVirtualCurrency to add the corresponding value.

The corresponding code is the following:

handlers.SetVCToStatistic = function (args, context){


    //Take Statistic 's' and the VirtualCurrency 'GC' for example:

    //1.Use GetPlayerStatistics to retrieve the value of a specific statistic.

    var statisticValue = server.GetPlayerStatistics({PlayFabId : currentPlayerId, StatisticNames: "s"}).Statistics[0].Value;  

    //2.Use  GetUserInventory to get the player’s current VC amount.


    var inventoryResult = server.GetUserInventory({PlayFabId: currentPlayerId});


    var vcValue = inventoryResult.VirtualCurrency.GC;

    // 3.Compare the VC value and the Statistic value, if the VC value is greater than the Statistic value, use SubtractUserVirtualCurrency to subtract the difference, otherwise, use AddUserVirtualCurrency to add the corresponding value.

    var diff = statisticValue - vcValue;

    if (diff > 0)
       server.AddUserVirtualCurrency({Amount: diff, PlayFabId: currentPlayerId, VirtualCurrency: "GC"});

    else if (diff < 0)
       server.SubtractUserVirtualCurrency({Amount: Math.abs(diff), PlayFabId: currentPlayerId, VirtualCurrency: "GC"})

    else 
        return;
}

You can use ExecuteCloudScript to execute it: https://docs.microsoft.com/en-us/gaming/playfab/features/automation/cloudscript/writing-custom-cloudscript#executing-cloudscript-functions-from-a-unity-game-client