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PlayFabSettings.staticSettings.DeveloperSecretKey = "__DEVELOPER_KEY__";
PlayFabSettings.staticSettings.TitleId = "__TITLE_ID__";
var response = await PlayFabAdminAPI.CreatePlayerSharedSecretAsync(new CreatePlayerSharedSecretRequest()
{
    FriendlyName = "__KEY_NAME__"
});

if (response.Error != null)
{
    Console.WriteLine(response.Error.GenerateErrorReport());
}
else
{
    Console.WriteLine(response.Result.SecretKey);
}

// Set development key and title id
PlayFabSettings.DeveloperSecretKey = "__DEVELOPER_KEY__";
PlayFabSettings.TitleId = "__TITLE_ID__";

public static async Task SetApiPermission(bool restrictCustomId)
{
    // The first statement denies every call to LoginWithCustomID that is not properly encrypted
    var filterCustom = new PermissionStatement
    {
        // Statement effects any action
        Action = "*",
        // Filter the case where there is no signature and payload is not encrypted
        ApiConditions = new ApiCondition()
        {
            HasSignatureOrEncryption = Conditionals.False
        },
        Comment = "Deny every request to LoginWithCustomID that is not properly encrypted",
        // Specify the resource name
        Resource = "pfrn:api--/Client/LoginWithCustomID", // Resource name
        // Deny any of such requests
        Effect = EffectType.Deny,
        // For any user
        Principal = "*"
    };
    // The second statement allows every other API call
    var filterNothing = new PermissionStatement()
    {
        // Statement effects any action
        Action = "*",
        Comment = "Allow the rest API calls",
        // For any resource name
        Resource = "pfrn:api--*",
        // Allow any request
        Effect = EffectType.Allow,
        // For any user
        Principal = "*"
    };

    // Update the policy
    var request = new UpdatePolicyRequest()
    {
        // ApiPolicy controls access to API methods
        PolicyName = "ApiPolicy",
        // In this example we overwrite the policy. Consider appending to the existing policy instead.
        OverwritePolicy = true,
        // Introduce policy statements
        Statements = new List<PermissionStatement> { filterNothing }
    };
    if (restrictCustomId)
        request.Statements.Add(filterCustom);
    var result = await PlayFabAdminAPI.UpdatePolicyAsync(request);

    // Handle possible errors
    if (result.Error != null)
        Console.WriteLine(result.Error.GenerateErrorReport());
    else
        Console.WriteLine("Policy updated");
}

var result = await PlayFabClientAPI.LoginWithCustomIDAsync(new LoginWithCustomIDRequest()
{
    CreateAccount = true,
    CustomId = "Some_Custom_Id"
});

if (result.Error != null)
{
    Console.WriteLine(result.Error.GenerateErrorReport());
}
else
{
    Console.WriteLine(result.Result.PlayFabId);
}

public static async Task DoEncryptedLogin()
{
    Console.WriteLine("Begin DoEncryptedLogin");

    // Use Player Shared Secret to get Title Public Key
    var titleKeyResult = await PlayFabClientAPI.GetTitlePublicKeyAsync(new GetTitlePublicKeyRequest
    {
        TitleId = TITLE_ID,
        TitleSharedSecret = CLIENT_SECRET_KEY
    });

    Console.WriteLine("Encrypt request");
    // Convert public key to bytes
    var cspBlob = Convert.FromBase64String(titleKeyResult.Result.RSAPublicKey);

    // Serialize certain part of the model into string (this will be encrypted).
    var encryptionModel = JsonWrapper.SerializeObject(new LoginWithCustomIDRequest { CustomId = "SOME_PLAYER_ID_ENCRYPTED" });
    string encryptedPayload;

    // RSA encryption
    using (var rsa = new RSACryptoServiceProvider())
    {
        rsa.ImportCspBlob(cspBlob);
        var bytesToEncrypt = Encoding.UTF8.GetBytes(encryptionModel);
        var encryptedBytes = rsa.Encrypt(bytesToEncrypt, false);
        encryptedPayload = Convert.ToBase64String(encryptedBytes);
    }

    // Use encrypted payload to construct a model
    var model = new LoginWithCustomIDRequest
    {
        EncryptedRequest = encryptedPayload,
        PlayerSecret = CLIENT_SECRET_KEY,
        CreateAccount = true
    };

    Console.WriteLine("Call LoginWithCustomIDAsync");
    // Finally execute the call
    var result = await PlayFabClientAPI.LoginWithCustomIDAsync(model);
    Console.WriteLine("LoginWithCustomIDAsync done");
    bool successful = result.Error == null && result.Result != null;
    if (!successful)
        Console.WriteLine(result.Error.GenerateErrorReport());
    else
        Console.WriteLine("Login Successful" + result.Result.PlayFabId);
}