LYNC Account Abstraction SDK

LYNC AA SDK is a no-code Unity SDK supporting PC (MacOS and Windows) and Mobile (Android and iOS). LYNC Unity Account Abstraction SDK, your solution to seamless gamer onboarding in Web3 Games! Enable effortless logins via socials, wallets, email, and more. Integrate swiftly into any game on Mac, Windows, Android, iOS, or browser. Simplify the gaming experience with LYNC AA SDK, connecting gamers effortlessly.

Get your API Key

Please get your API key before downloading the SDK from here​

Installation

Download the LYNC Account Abstraction SDK from Here​

Example Project: https://github.com/LYNC-WORLD/LYNC-Unity-AA/tree/main/Assets/LYNC-AA-SDK

Import the SDK .unitypackage file to your project. or simply drag and drop .unitypackage file to your project.

Assets -> Import Package -> Custom Package

Once the Account Abstraction SDK package has finished importing into your Unity project, you can begin integrating it into your game.

The Folder structure looks like this

SDK Folder Structure

Integrating AA SDK in Unity

There are 3 Example Projects present in the SDK:

Assets -> LYNC-AA-SDK -> Example / Example-2 / Example-3

Example Projects

You can find the example scene in the folders. Simply pass the API key in lyncManager GameObject.

To test, Build and Run after adding this scene in (Scene in Build).

Pass LYNC API Key​

Setup the Project

To use LYNC Account Abstraction. Attach LYNC Manager Prefab(Assets/LYNC-AA-SDK/LYNC Manager. prefab), on the starting scene. This will serve as the starting point for your project.

In LYNC Manager Prefab, be sure to provide the following details:

1. LYNC API Key (The API Key can be generated from here)

2. Choose chain

3. Choose Network (Testnet/ Mainnet)

4. Pass in the Dapp API Key (The API key can be generated from the Biconomy Dashboard )

5. Web3 Auth Client ID (The API key can be generated from the Web3 Auth Dashboard)

6. Pass a deep link name (example: lync/gameName etc.)

Integrating Login or Transaction Layer via Account Abstraction in Unity

Login Flow

No-Code Login Flow:

You can attach the Login Example Script in any scene where you want users to login, by dragging and dropping a Button as a Game Object.

Attach loginExample Script

Login Flow with Code:

Login and Transactions can be done once the LyncReady action is triggered.

Assets -> LYNC-AA-SDK -> Example-2 -> loginExample.cs

The Sample Code for Login can be found at loginExample.cs, LoginTransactionExample.cs and ExampleLogin.cs

Make sure to Import LYNC.

using LYNC;
using LYNC.Wallet;

Example (Event Trigger):

LYNC ready Should be a function which has an argument of type "LyncManager"

LyncManager.onLyncReady += LyncReady;

private void LyncReady(LyncManager Lync)
    {
        // Once LYNC is ready, you can do any steps like Login, Logout, Transactions etc.
        
        //To Login:
        Lync.WalletAuth.ConnectWallet((wallet) =>
        {
            addressTxt.text = "Wallet Address: " + wallet.publicAddress;
            loginDateTxt.text = "Login Date: " + wallet.loginDate.ToString();
            string smartAccountAddress = walletData.SmartAccount;
        });
        
        //To Logout:
        Lync.WalletAuth.Logout();
    }

To Check if the user is logged in or not:

WalletData walletData = WalletData.TryLoadSavedWallet();
if (walletData.WalletConnected){
    // User is already logged in
}
else{
    // Ask user to login
}

To get the User's wallet address, if the user is logged in

string EOAWalletAddress = walletData.PublicAddress
string SmartAccountAddress = walletData.SmartAccount
string EmailAddress=  walletData.Email;
string UserName = walletData.UserName;
string IdToken = walletData.IdToken;

To Fetch from PlayerPrefs:

string publicAddress = PlayerPrefs.GetString("_publicAddress");
string smartAccount = PlayerPrefs.GetString("_smartAccount");
string email = PlayerPrefs.GetString("_email");
string userName = PlayerPrefs.GetString("_userName");
string idToken = PlayerPrefs.GetString("_idToken");

To Login directly:

LyncManager.Instance.WalletAuth.ConnectWallet(loginUrl, (walletData) =>
{
    // Get all the user's wallet data from "walletData"
});

To Logout directly:

LyncManager.Instance.WalletAuth.Logout();

Transaction Flow

There are two methods for proceeding with a transaction:

1. Gasless Transaction - Game Developer/ Game Studio will be sponsoring the transaction fee (Function Name: SendTransaction).

2. User Paid Transaction- The Gamer/ User will be responsible for paying the gas fee and cost if any, required to do the transaction (Function Name: SendUserPaidTransaction).

Gasless Transaction

The limitation with gasless transaction is that, you can't have a cost required in the smart contract.

To do transactions, TokenExample.cs and LoginTransactionExample.cs can be taken as a reference.

Pass in the Contract Address and Function Name Example: MintNFT(). MintNFT(unit256 id, unit256 amount)

Args are not compulsory parameters, but if the function accepts any argument, make sure to pass them.

Token Transactions

To do it from the script:

LyncManager.Instance.blockchainMiddleware.SendTransaction(contractAddress, functionName, args, onSuccess,onError);

onSuccess: Once the transactions are completed, this handles what to do.

onError: If the transactions failed, this handles what to do.

Setup Gasless Transactions with Biconomy

To enable gasless transactions via Biconomy, Register a new paymaster on the Biconomy Dashboard. Make sure you select the version: 1.0.1

Once done, Get the API Key and Pass it to the LYNC Manager.

Biconomy API Key

Setup the gas tank, in Policies create a new one and pass the contract address

Contract Address setup

That's it, now you can do the gasless transaction on this contract address passing in the LYNC AA SDK.

User Paid Transaction

This will require gamers/ users to have some funds in their wallet on the chain you are using. There are two ways, You can ask users to send some tokens to this smart account or use LYNC on-ramp/ off-ramp for gamers allowing them to add funds via credit/ debit card, Apple Pay, Google Pay etc.

User Paid Transactions are similar to Gasless transactions to use, there is only one more parameter required to send is cost in ethers (ex. 0.1).

LYNC.LyncManager.Instance.blockchainMiddleware.SendUserPaidTransaction(contractAddress, functionName, arguments,cost, On721TrxCompleted, onError);

You can see the Assets/LYNC-AA-SDK/Example-2/TransactionExample.cs example script as a reference.

Some common bugs and their resolutions

Problem: Newtonsoft JSON is missing.

Solution: Please, Add this as a git URL in adding package

com.unity.nuget.newtonsoft-json