thing.

thing.cs

public class V1CurrentPlayerData
{
    // a bunch of random bullshit has to happen for these to get the right values when you run the app
    public static string username;
    public static int points;
}


public class V1ExampleUsage
{
    public void Update()
    {
        Debug.Log(V1CurrentPlayerData.username);
    }
}

// Okay so we refactor into using an interface

public interface V2CurrentPlayerData
{
    // Define an interface with that structure instead of the impl everyone reads/writes to.

    // I don't really know csharpisms lol so here i'll just lay out all the functions.
    public int getPoints();
    public void setPoints(int p);
    public string getUsername();
    public void setUsername(string s);

    // Here's your static instance where all the data goes! It could be anywhere tbh. Here for convenience.
    public static V2CurrentPlayerData Instance = new V2CurrentPlayerDataProd();
}

public class V2CurrentPlayerDataProd : V2CurrentPlayerData
{
    // Normal stuff here
    private int points;
    private string username;
    public int getPoints() { return points; }
    public void setPoints(int p) { points = p; }
    public string getUsername() { return username; }
    public void setUsername(string u) { username = u;}
}

public class V2CurrentPlayerDataTestingThings : V2CurrentPlayerData
{
    // This impl is for you to skip all the prod shit and just skip to the values you want to try out your code with.
    public int getPoints() { return 12345123; }
    public void setPoints(int p) { /* shrug */ }
    public string getUsername() { return null; /* Let's see what happens if username is null! */ }
    public void setUsername(string u) { /*shrug*/}
}