Unity SDK Integration

Overview

The ChainSafe Unity SDK provides toolkit for Game Developers to interact with blockchains. It will give you the proper tools to connect to the network, send and sign transactions, interact with smart contracts, fetch balances (coins, NFTs, tokens) and more.

You can get the official documentation of the ChainSafe SDK here: https://docs.gaming.chainsafe.io/

Key features

Installation
Before you start
Create a new Unity project
Custom Call
Custom Interaction with Login
How to use the KIP7 token
How to use the KIP17 token
How to use the KIP37 token

Installation

Developer Environment

VS Code
Metamask
Unity Hub and Unity

ChainSafe SDK

Go to the ChainSafe Gaming SDK from their GitHub repository called web3.unity at https://github.com/chainsafe

Select the latest release
Click on web3.unitypackage to download the package

Unity Hub

Go to https://unity3d.com/fr/get-unity/download
Choose the version : 2020.3.x

Activate your license

create a new Unity account
click on Activate New License
select Unity Personal
select I don't use Unity in a professional capacity

Before you start

To get started, here are some details you should consider while reading the documentation.

Klaytn Gas Fee

Klaytn has a fixed gas fee, so make sure to do the following steps to setting up your Metamask:

Click on Turn on Enhanced Gas Fee UI in Settings to set gas fee
Set the Enable Enhanced Gas Fee UI toggle to ON and exit Settings.

Click here for more details.

Klaytn RPC URL and Chain ID

Klaytn mainnet: RPC URL = https://public-node-api.klaytnapi.com/v1/cypress Chain ID = 8217

Klaytn testnet: RPC URL = https://api.baobab.klaytn.net:8651/ Chain ID = 1001

ABI formatting

The ABI has a special formatting. Replace the " with \" , otherwise it will not be recognise by the SDK.

Example:

string abi = "[ { \"inputs\": [ { \"internalType\": \"uint8\", \"name\": \"_myArg\", \"type\": \"uint8\" } ], \"name\": \"addTotal\", \"outputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [], \"name\": \"myTotal\", \"outputs\": [ { \"internalType\": \"uint256\", \"name\": \"\", \"type\": \"uint256\" } ], \"stateMutability\": \"view\", \"type\": \"function\" } ]";

Solving System.ComponentModel.Win32Exception Error

You may encounter this error: System.ComponentModel.Win32Exception (2): No such file or directory while building the project if you are using macOS. If it's the case, follow these steps:

install python 2.7
activate it in your project environment by running pyenv global 2.7.18 (to make it the default version everywhere) or pyenv local 2.7.18 (to make only the current directory use this version)
create a folder called Editor under Assets under Project window. Inside Editor, create a C# file called PreBuildProcessing and use the code bellow
restart and build your project

Please refer to this link for more details: https://forum.unity.com/threads/case-1412113-builderror-osx-12-3-and-unity-2020-3-constant-build-errors.1255419/

 using UnityEditor;
 using UnityEditor.Build;
 using UnityEditor.Build.Reporting;
 using UnityEngine;
 
 public class PreBuildProcessing : IPreprocessBuildWithReport
 {
     public int callbackOrder => 1;
     public void OnPreprocessBuild(BuildReport report)
     {
         System.Environment.SetEnvironmentVariable("EMSDK_PYTHON", "/Library/Frameworks/Python.framework/Versions/2.7/bin/python");
     }
 }

Solving the Newtonsoft Error

Install JSON.NET to fix: The type or namespace name 'Newtonsoft' could not be found error.

After downloading the package you will need to import it into your project.

The steps for importing this package are as follows:

Window -> Package Manager -> My Assets -> JSON.NET For Unity -> Import

Create a new Unity Project

The SDK / Unity plugin supports all Unity project types. In this example, we will create an empty 3D project.

To create a new project, open Unity Hub, select All templates, we will use a 3D template, then click on Create project.

Now, you have created a new project. Then we need to import the SDK into our project
Drag the downloaded web3.unitypackage file in the Installation section into the Unity project

Depending on the version of Unity you are using, you might see the error in the screen below. If it’s the case, please refer to the Solving the Newtonsoft Error section to solve it.

Custom Call

In this section you will see how to get the balance of a given address on Klaytn mainnet, using a RPC provider.

Start by creating a new project by following the steps at the section Create a new Unity project.

Make sure to install all dependencies to fix all bugs.

Create your C# script on Unity

Click on Web3Unity package → Prefabs → EVM → Custom Call
Drag the CustomCall prefab into the scene.

Double-click on the CustomCallExample script to open it on VSCode

Use the script below or modify it

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CustomCallExample : MonoBehaviour
{
    async void Start()
    {
        // set chain: ethereum, polygon, klaytn, etc
        string chain = "klaytn";
        // set network mainnet, testnet
        string network = "mainnet"; 
        // set smart contract address
        string account = "0x94404aEc273e50f741c0e166CC55a372D5c6Df7C";
        // set rpc endpoint url
        string rpc = "https://public-node-api.klaytnapi.com/v1/cypress";
        
        // call a transaction
        string balance = await EVM.BalanceOf(chain, network, account, rpc);
        // display response in game
        print(balance);      
       
    }
}

Edit the network chainID under Assets → WebGLTemplates → Web3GL-2020x → network.js. Set the window.web3ChainId to 8217 (Klaytn mainnet)
Run the script by clicking on the ▶️ button above the scene
Open the console to see the result
The console shows the balance of the given contract on Klaytn mainnet.

Custom Interaction with Login

In this section you will see how to build a Unity project with a login button to connect a web3 wallet and two other buttons to write and read the contract.

Start by creating a new project by following the steps at the section Create a new Unity project.

Make sure to install all dependencies to fix all bugs.

Use the WebLogin prefab to enable web3 wallet connection

Under Assets → Web3Unity → Scenes, double-click on WebLogin. This is the prefab used to connect a wallet in a WebGL project.

Go to File → Build Settings → WebGL → Switch Platform

From the same window, click on Add Open Scenes (top right) to add the Login scene as the first scene to appear when we run the project.
From the same window, click on Player Settings → Player → Resolution and Presentation, under WebGL Template, select the one with the same as our Unity version (WebGL 2020 for our case).

Go back to the Unity project. Under Assets, select Scenes and double-click on SampleScene to use it as our second scene (FYI the first one is the login scene)
Go to File → Build Settings → Add Open Scenes. The SampleScene will appear under the WebLogin scene. It means the SampleScene, where we will create the buttons to read and write to the contract, will be the next scene after the WebLogin. :warning: Make sure the WebLogin scene is at the top because the order matters.

Create your contract

Open Remix IDE, install the Klaytn Remix plugin then paste the code below:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Storage { 

    uint256 number;

    function store(uint256 num) public {
        number = num;
    }

    function retrieve() public view returns (uint256) {
        return number;
    }
}

Compile your contract and deploy it to baobab testnet (get your faucet here).

Create your C# script on Unity

Under Project window, right-click on Scenes, click on Create → C# Script

Rename it (here we’ll use the name “CallABI”)

Double-click on the script to open it. Complete the script with the information below

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;

public class CustomCallABIExample : MonoBehaviour
{

    // set chain
    string chain = "klaytn";
    // set network
    string network = "testnet";
    // set contract address
    private string contract = "0xDf5A1aAa8C1E6a7b4e42dA606Ed8e43BeF764D13";
    // set contract ABI
    private readonly string abi = "[{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"num\",\"type\":\"uint256\"}],\"name\":\"store\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0x6057361d\"},{\"inputs\":[],\"name\":\"retrieve\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x2e64cec1\"}]";
    // set RPC endpoint url
    string rpc = "https://public-node-api.klaytnapi.com/v1/baobab";

    // Call the "store" function with "10" as argument
    async public void AddValue()
    {
        // contract function 
        string method = "store";
        // argument
        string args = "[\"10\"]";
        // value in ston (wei) in a transaction
        string value = "0";
        // gas limit (OPTIONAL)
        string gasLimit = "";
        // gas price (OPTIONAL)
        string gasPrice = "";

        try 
        {
            string response = await Web3GL.SendContract(method, abi, contract, args, value, gasLimit, gasPrice);
            Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }

    // Call the retrieve function
    async public void GetValue()
    {
        // contract function
        string method = "retrieve";
        // arguments
        string args = "[]";
        try
        {
            string response = await EVM.Call(chain, network, contract, abi, method, args, rpc);
            Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }
}

Create the buttons

Right-click on the scene, click on UI → Button and rename it to AddValue and RetrieveValue

To interact with the buttons:

Click on AddValue button from the Hierarchy window
Drag the CallABI script into the right window
Add an On Click() function by clicking on the ➕ button

Drag the AddValue button from Hierarchy window into the On Click() function
Click on No Function → CallABI → AddValue()

For the RetrieveValue button, redo the steps from step 1 to step 5 above, but instead of selecting AddValue, select RetrieveValue

Edit the network chainID under Assets → WebGLTemplates → Web3GL-2020x → network.js. Set the window.web3ChainId to 1001.

To test the Retrieve Value function, click on play ▶️ and click on Retrieve Value

To test the Add Value function , click File → Build and Run. You will have a new window in the browser that will show you the login interface

Click on Login to connect to Metamask
Click on Add Value to add the value of 10 to the contract
Confirm your transaction on Metamask and voilà ! Your transaction is sent to the network.

How to use the KIP7 token

In this section you will see how to build a Unity project using the KIP7 (ERC-20) token standard on Klaytn.

Start by creating a new project by following the steps at the section Create a new Unity project.

Make sure to install all dependencies to fix all bugs.

Use the WebLogin prefab to enable web3 wallet connection

Under Assets → Web3Unity → Scenes, double-click on WebLogin. This is the prefab used to connect a wallet in a WebGL project

Go to File → Build Settings → WebGL → Switch Platform

From the same window, click on Add Open Scenes (top right) to add the Login scene as the first scene to appear when we run the project.
From the same window, click on Player Settings → Player → Resolution and Presentation, under WebGL Template, select the one with the same as our Unity version (WebGL 2020 for our case).

Go back to the Unity project. Under Assets, select Scenes and double-click on SampleScene to use it as our second scene (FYI the first one is the login scene)
Go to File → Build Settings → Add Open Scenes. The SampleScene will appear under the WebLogin scene. It means the SampleScene, where we will create the buttons to read and write to the contract, will be the next scene after the WebLogin. :warning: Make sure the WebLogin scene is at the top because the order matters.

Create your contract

Open Remix IDE, install the Klaytn Remix plugin then paste the code below:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@klaytn/contracts/KIP/token/KIP7/KIP7.sol";
import "@klaytn/contracts/access/Ownable.sol";

contract MyToken is KIP7, Ownable {
    constructor() KIP7("Test Token", "TST") {     
        _mint(msg.sender, 100000 * 10 ** 18);        
    }

     function mintToken(address account, uint256 amount) public onlyOwner {
        _safeMint(account, amount);
    }
}

Compile your contract and deploy it to baobab testnet. Get your faucet here.

Create your C# script on Unity

Under Project window, right-click on Scenes, click on Create → C# Script. Use the script below.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using System.Numerics;
using UnityEngine.UI;
using Newtonsoft.Json;

public class ERC20CUSTOM : MonoBehaviour
{


    // set chain: ethereum, polygon, klaytn, etc
    string chain = "klaytn";
    // set network mainnet, testnet
    string network = "testnet"; 
    // wallet address that deployed the contract
    private string account = "0x7b9B65d4ee2FD57fC0DcFB3534938D31f63cba65";
    // set ABI
    private readonly string abi = "[ { \"inputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"constructor\" }, { \"anonymous\": false, \"inputs\": [ { \"indexed\": true, \"internalType\": \"address\", \"name\": \"owner\", \"type\": \"address\" }, { \"indexed\": true, \"internalType\": \"address\", \"name\": \"spender\", \"type\": \"address\" }, { \"indexed\": false, \"internalType\": \"uint256\", \"name\": \"value\", \"type\": \"uint256\" } ], \"name\": \"Approval\", \"type\": \"event\" }, { \"anonymous\": false, \"inputs\": [ { \"indexed\": true, \"internalType\": \"address\", \"name\": \"previousOwner\", \"type\": \"address\" }, { \"indexed\": true, \"internalType\": \"address\", \"name\": \"newOwner\", \"type\": \"address\" } ], \"name\": \"OwnershipTransferred\", \"type\": \"event\" }, { \"anonymous\": false, \"inputs\": [ { \"indexed\": true, \"internalType\": \"address\", \"name\": \"from\", \"type\": \"address\" }, { \"indexed\": true, \"internalType\": \"address\", \"name\": \"to\", \"type\": \"address\" }, { \"indexed\": false, \"internalType\": \"uint256\", \"name\": \"value\", \"type\": \"uint256\" } ], \"name\": \"Transfer\", \"type\": \"event\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"owner\", \"type\": \"address\" }, { \"internalType\": \"address\", \"name\": \"spender\", \"type\": \"address\" } ], \"name\": \"allowance\", \"outputs\": [ { \"internalType\": \"uint256\", \"name\": \"\", \"type\": \"uint256\" } ], \"stateMutability\": \"view\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"spender\", \"type\": \"address\" }, { \"internalType\": \"uint256\", \"name\": \"amount\", \"type\": \"uint256\" } ], \"name\": \"approve\", \"outputs\": [ { \"internalType\": \"bool\", \"name\": \"\", \"type\": \"bool\" } ], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"account\", \"type\": \"address\" } ], \"name\": \"balanceOf\", \"outputs\": [ { \"internalType\": \"uint256\", \"name\": \"\", \"type\": \"uint256\" } ], \"stateMutability\": \"view\", \"type\": \"function\" }, { \"inputs\": [], \"name\": \"decimals\", \"outputs\": [ { \"internalType\": \"uint8\", \"name\": \"\", \"type\": \"uint8\" } ], \"stateMutability\": \"view\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"spender\", \"type\": \"address\" }, { \"internalType\": \"uint256\", \"name\": \"subtractedValue\", \"type\": \"uint256\" } ], \"name\": \"decreaseAllowance\", \"outputs\": [ { \"internalType\": \"bool\", \"name\": \"\", \"type\": \"bool\" } ], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"spender\", \"type\": \"address\" }, { \"internalType\": \"uint256\", \"name\": \"addedValue\", \"type\": \"uint256\" } ], \"name\": \"increaseAllowance\", \"outputs\": [ { \"internalType\": \"bool\", \"name\": \"\", \"type\": \"bool\" } ], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"account\", \"type\": \"address\" }, { \"internalType\": \"uint256\", \"name\": \"amount\", \"type\": \"uint256\" } ], \"name\": \"mintToken\", \"outputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [], \"name\": \"name\", \"outputs\": [ { \"internalType\": \"string\", \"name\": \"\", \"type\": \"string\" } ], \"stateMutability\": \"view\", \"type\": \"function\" }, { \"inputs\": [], \"name\": \"owner\", \"outputs\": [ { \"internalType\": \"address\", \"name\": \"\", \"type\": \"address\" } ], \"stateMutability\": \"view\", \"type\": \"function\" }, { \"inputs\": [], \"name\": \"renounceOwnership\", \"outputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"recipient\", \"type\": \"address\" }, { \"internalType\": \"uint256\", \"name\": \"amount\", \"type\": \"uint256\" } ], \"name\": \"safeTransfer\", \"outputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"recipient\", \"type\": \"address\" }, { \"internalType\": \"uint256\", \"name\": \"amount\", \"type\": \"uint256\" }, { \"internalType\": \"bytes\", \"name\": \"_data\", \"type\": \"bytes\" } ], \"name\": \"safeTransfer\", \"outputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"sender\", \"type\": \"address\" }, { \"internalType\": \"address\", \"name\": \"recipient\", \"type\": \"address\" }, { \"internalType\": \"uint256\", \"name\": \"amount\", \"type\": \"uint256\" } ], \"name\": \"safeTransferFrom\", \"outputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"sender\", \"type\": \"address\" }, { \"internalType\": \"address\", \"name\": \"recipient\", \"type\": \"address\" }, { \"internalType\": \"uint256\", \"name\": \"amount\", \"type\": \"uint256\" }, { \"internalType\": \"bytes\", \"name\": \"_data\", \"type\": \"bytes\" } ], \"name\": \"safeTransferFrom\", \"outputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"bytes4\", \"name\": \"interfaceId\", \"type\": \"bytes4\" } ], \"name\": \"supportsInterface\", \"outputs\": [ { \"internalType\": \"bool\", \"name\": \"\", \"type\": \"bool\" } ], \"stateMutability\": \"view\", \"type\": \"function\" }, { \"inputs\": [], \"name\": \"symbol\", \"outputs\": [ { \"internalType\": \"string\", \"name\": \"\", \"type\": \"string\" } ], \"stateMutability\": \"view\", \"type\": \"function\" }, { \"inputs\": [], \"name\": \"totalSupply\", \"outputs\": [ { \"internalType\": \"uint256\", \"name\": \"\", \"type\": \"uint256\" } ], \"stateMutability\": \"view\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"to\", \"type\": \"address\" }, { \"internalType\": \"uint256\", \"name\": \"amount\", \"type\": \"uint256\" } ], \"name\": \"transfer\", \"outputs\": [ { \"internalType\": \"bool\", \"name\": \"\", \"type\": \"bool\" } ], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"from\", \"type\": \"address\" }, { \"internalType\": \"address\", \"name\": \"to\", \"type\": \"address\" }, { \"internalType\": \"uint256\", \"name\": \"amount\", \"type\": \"uint256\" } ], \"name\": \"transferFrom\", \"outputs\": [ { \"internalType\": \"bool\", \"name\": \"\", \"type\": \"bool\" } ], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [ { \"internalType\": \"address\", \"name\": \"newOwner\", \"type\": \"address\" } ], \"name\": \"transferOwnership\", \"outputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"function\" } ]";
    // set rpc endpoint url
    string rpc = "https://public-node-api.klaytnapi.com/v1/baobab";

    // set contract address
    private string contract = "0xAc88Ee877D1dCf6da3672099FE4618c9d30F0d0B";
    // set recipient address
    private string toAccount = "0x7AB1b3C8396aDE55F959fB9B2dA43deFDdA23c52";
    // set amount to transfer
    private string amount = "10000";

    // Use this if you want to display the balance of an account
    /*public Text balance;

    
     void Start() 
     {
         string account = PlayerPrefs.GetString("Account");
         balance.text = account;
    }
    */

    // call the "name" function
    async public void Name()
    {
        // function name
        string method = "name";
        // arguments
        string args = "[]";
        try
        {
        string response = await EVM.Call(chain, network, contract, abi, method, args,rpc);            
        Debug.Log("Token name: " + response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }

    // call the "totalSupply" function
    async public void TotalSupply()
    {
        // function name
        string method = "totalSupply";
        // arguments
        string args = "[]";
        try
        {
        string response = await EVM.Call(chain, network, contract, abi, method, args,rpc);            
            Debug.Log("Total Supply: " + response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }

    // call the "balanceOf" function
    async public void BalanceOf()
    {
        // function name
        string method = "balanceOf";
        // arguments
        string args = "[\"0x7b9B65d4ee2FD57fC0DcFB3534938D31f63cba65\"]";
        try
        {
        string response = await EVM.Call(chain, network, contract, abi, method, args,rpc);            
            Debug.Log("Balance of 0x7b9B65d4ee2FD57fC0DcFB3534938D31f63cba65: " + response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }

    // call the "transfer" function
    async public void Transfer()
    {
        // function name
        string method = "transfer";
        // put arguments in an array of string
        string[] obj = {toAccount, amount};
        // serialize arguments
        string args = JsonConvert.SerializeObject(obj);
        // value in ston (wei) in a transaction
        string value = "0";
        // gas limit: REQUIRED
        string gasLimit = "1000000";
        // gas price: REQUIRED
        string gasPrice = "250000000000";
        try
        {          
        string response = await Web3GL.SendContract(method, abi, contract, args, value, gasLimit, gasPrice);            
            Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }
    
      // call the "safeTransfer" function
      async public void SafeTransfer()
    {
        string method = "safeTransfer";
        string[] obj = {toAccount, amount};
        string args = JsonConvert.SerializeObject(obj);
        string value = "0";
        // gas limit OPTIONAL
        string gasLimit = "1000000";
        // gas price OPTIONAL
        string gasPrice = "250000000000";
        try
        {
        //string response = await Web3GL.SendContract(chain, network, contract, abi, method, args,rpc);            
        string response = await Web3GL.SendContract(method, abi, contract, args, value, gasLimit, gasPrice);            
        Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }

    // call the "mintToken" function
    async public void Mint()
    {
        // recipient
        string toAccount = "0x57468012dF29B5f1C4b5baCD1CD2F0e2eC323316";
        // amount to send
        string amount = "100";
        // function name
        string method = "mintToken";
        // put arguments in an array of string
        string[] obj = {toAccount, amount};
        // serialize arguments
        string args = JsonConvert.SerializeObject(obj);
        // value in ston (wei) in a transaction
        string value = "0";
        // gas limit: REQUIRED
        string gasLimit = "1000000";
        // gas price: REQUIRED
        string gasPrice = "250000000000";
        try
        {            
        string response = await Web3GL.SendContract(method, abi, contract, args, value, gasLimit, gasPrice);           
            Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }
    
    // call the "approve" function
    async public void Approve()
    {
        // spender
        string spender = "0x57468012dF29B5f1C4b5baCD1CD2F0e2eC323316";
       // amount
        string amount = "100";
       // function name
        string method = "approve";
       // put arguments in an array of string
        string[] obj = {spender, amount};
       // serialize arguments
        string args = JsonConvert.SerializeObject(obj);
        string value = "0";
       // gas limit OPTIONAL
        string gasLimit = "1000000";
       // gas price OPTIONAL
        string gasPrice = "250000000000";
        try
        {            
        string response = await Web3GL.SendContract(method, abi, contract, args, value, gasLimit, gasPrice);           
        Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }
}

We will create 7 buttons ( Name, Total Supply, BalanceOf, Transfer, SafeTransfer, Mint and Approve) on the UI to interact with our KIP7 token.
To create the buttons, follow the steps in the section Custom Interaction with Login.
Your UI should look like this:

Link each button the the corresponding function in the contract. E.g here, we linked the button “Name” to the function “Name()” in the script, which calls the function “name()” in the contract

Change the chainId of the network in the WebGL Templates folder to 1001 to connect to baobab testnet

Click on ▶️ to run the program and test the Name, Total Supply and BalanceOf buttons

Test the Transfer and the Mint function

To test the Transfer, we need to build and run the project. So go to File → Build and Run
Click on Login to connect Metamask

Once connected, click on Transfer to execute the KIP7 token transfer

Here are the details of the transaction on Klaytnscope

To test the Mint and SafeTransfer function, click on the corresponding button and confirm your transaction. Here’s the detail of a confirmed transaction on Klaytnscope.

How to use the KIP17 token

In this section you will see how to build a Unity project using the KIP17 (ERC-721) token standard on Klaytn.

Start by creating a new project by following the steps at the section Create a new Unity project.

Make sure to install all dependencies to fix all bugs.

Use the WebLogin prefab to enable web3 wallet connection

Under Assets → Web3Unity → Scenes, double-click on WebLogin. This is the prefab used to connect a wallet in a WebGL project

Go to File → Build Settings → WebGL → Switch Platform

From the same window, click on Add Open Scenes (top right) to add the Login scene as the first scene to appear when we run the project.
From the same window, click on Player Settings → Player → Resolution and Presentation, under WebGL Template, select the one with the same as our Unity version (WebGL 2020 for our case).

Go back to the Unity project. Under Assets, select Scenes and double-click on SampleScene to use it as our second scene (FYI the first one is the login scene)
Go to File → Build Settings → Add Open Scenes. The SampleScene will appear under the WebLogin scene. It means the SampleScene, where we will create the buttons to read and write to the contract, will be the next scene after the WebLogin. :warning: Make sure the WebLogin scene is at the top because the order matters.

Create your contract

Open Remix IDE, install the Klaytn Remix plugin then paste the code below:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@klaytn/contracts/KIP/token/KIP17/KIP17.sol";
import "@klaytn/contracts/KIP/token/KIP17/extensions/KIP17Enumerable.sol";
//import "@klaytn/contracts/access/Ownable.sol;
import "@klaytn/contracts/utils/Counters.sol";

contract HappyMonkey is KIP17, KIP17Enumerable {

    using Counters for Counters.Counter;

    Counters.Counter private _tokenIdCounter;

    uint256 public MINT_PRICE = 0.05 ether;
    uint public MAX_SUPPLY = 100;

    constructor() KIP17("HappyMonkey", "HM") {
        // Start token ID at 1. By default is starts at 0.
        _tokenIdCounter.increment();
    }

    function withdraw() public {
        require(address(this).balance > 0, "Balance is zero");
        payable(msg.sender).transfer(address(this).balance);
    }

    function safeMint(address to) public payable {
        require(totalSupply() < MAX_SUPPLY, "Can't mint anymore tokens.");

        require(msg.value >= MINT_PRICE, "Not enough ether sent.");
        uint256 tokenId = _tokenIdCounter.current();
        _tokenIdCounter.increment();
        _safeMint(to, tokenId);
    }

    function _baseURI() internal pure override returns (string memory) {
        return "ipfs://happyMonkeyBaseURI/";
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId)
        internal
        override(KIP17, KIP17Enumerable)
    {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    // The following functions are overrides required by Solidity.

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(KIP17, KIP17Enumerable)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
}

Find the ERC721 source code here.

Compile your contract and deploy it to baobab testnet faucet here.

Create your C# script on Unity

Under Project window, right-click on Scenes, click on Create → C# Script

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using System.Numerics;
using UnityEngine.UI;
using Newtonsoft.Json;

public class KIP17Example : MonoBehaviour
{
    // set chain: ethereum, polygon, klaytn, etc
    string chain = "klaytn";
    // set network mainnet, testnet
    string network = "testnet";
    // set contract address
    private string contract = "0x1625026Eb24A40728dC3c574d10Cf08ee38cBC9A";
    // set contract ABI
    private readonly string abi = "[{\"inputs\":[{\"internalType\":\"string\",\"name\":\"name\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"symbol\",\"type\":\"string\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\",\"signature\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"approved\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\",\"signature\":\"0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bool\",\"name\":\"approved\",\"type\":\"bool\"}],\"name\":\"ApprovalForAll\",\"type\":\"event\",\"signature\":\"0x17307eab39ab6107e8899845ad3d59bd9653f200f220920489ca2b5937696c31\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\",\"signature\":\"0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\",\"signature\":\"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0x095ea7b3\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x70a08231\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"getApproved\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x081812fc\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"}],\"name\":\"isApprovedForAll\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0xe985e9c5\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x06fdde03\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x8da5cb5b\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"ownerOf\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x6352211e\"},{\"inputs\":[],\"name\":\"renounceOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0x715018a6\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"safeTransferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0x42842e0e\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"},{\"internalType\":\"bytes\",\"name\":\"_data\",\"type\":\"bytes\"}],\"name\":\"safeTransferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0xb88d4fde\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"},{\"internalType\":\"bool\",\"name\":\"approved\",\"type\":\"bool\"}],\"name\":\"setApprovalForAll\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0xa22cb465\"},{\"inputs\":[{\"internalType\":\"bytes4\",\"name\":\"interfaceId\",\"type\":\"bytes4\"}],\"name\":\"supportsInterface\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x01ffc9a7\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x95d89b41\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"tokenURI\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0xc87b56dd\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0x23b872dd\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0xf2fde38b\"},{\"inputs\":[{\"internalType\":\"string\",\"name\":\"baseURI_\",\"type\":\"string\"}],\"name\":\"setBaseURI\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0x55f804b3\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"recipient\",\"type\":\"address\"},{\"internalType\":\"string\",\"name\":\"tokenURI\",\"type\":\"string\"}],\"name\":\"mintNFT\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0xeacabe14\"}]";
    // set rpc url endpoint
    //string rpc = "https://public-node-api.klaytnapi.com/v1/baobab";

    // Call the "owner" function with "10" as argument
    async public void GetOwner()
    {
        // function name
        string method = "owner";
        // arguments
        string args = "[]";
        try
        {
            string response = await EVM.Call(chain, network, contract, abi, method, args);
            Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }
    
    // Call the "safeMint" function 
    async public void SafeMint()
    {
        // function name
        string method = "safeMint";
        // arguments
        string args = "[\"0x646268287Aa8A20947d781E845Cb9631A644D1E1\"]";
        // value in ston to add in the transaction 
        string value = "50000000000000000";
        // gas limit: REQUIRED
        string gasLimit = "1000000";
        // gas price: REQUIRED
        string gasPrice = "250000000000";

        try 
        {
            string response = await Web3GL.SendContract(method, abi, contract, args, value, gasLimit, gasPrice);
            Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }
    
     // Call the "approve" function 
    async public void Approve()
    {
        // spender
        string to = "0x57468012dF29B5f1C4b5baCD1CD2F0e2eC323316";
        // token ID
        string tokenId = "1";
        // function name
        string method = "approve";
        string[] obj = {to, tokenId};
        // arguments
        string args = JsonConvert.SerializeObject(obj);
        // value in ston to add in the transaction 
        string value = "50000000000000000";
        // gas limit: REQUIRED
        string gasLimit = "1000000";
        // gas price: REQUIRED
        string gasPrice = "250000000000";

        try 
        {
            string response = await Web3GL.SendContract(method, abi, contract, args, value, gasLimit, gasPrice);
            Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }
}

Create the buttons

We will create 2 buttons (Owner, Approve and Mint) on the UI to interact with our KIP17 token.

To create the buttons, follow the steps in the section Custom Interaction with Login.

Build and Run the project

Go to File → Build and Run
Click on Login to connect Metamask
Click on Mint and confirm your transaction

Here are the details of the transaction on Klaytnscope.

How to use the KIP37 token

In this section you will see how to build a Unity project using the KIP37 (ERC-1155) token standard on Klaytn.

Start by creating a new project by following the steps at the section Create a new Unity project.

Make sure to install all dependencies to fix all bugs.

Use the WebLogin prefab to enable web3 wallet connection

Under Assets → Web3Unity → Scenes, double-click on WebLogin. This is the prefab used to connect a wallet in a WebGL project

Go to File → Build Settings → WebGL → Switch Platform

From the same window, click on Add Open Scenes (top right) to add the Login scene as the first scene to appear when we run the project.
From the same window, click on Player Settings → Player → Resolution and Presentation, under WebGL Template, select the one with the same as our Unity version (WebGL 2020 for our case).

Go back to the Unity project. Under Assets, select Scenes and double-click on SampleScene to use it as our second scene (FYI the first one is the login scene)
Go to File → Build Settings → Add Open Scenes. The SampleScene will appear under the WebLogin scene. It means the SampleScene, where we will create the buttons to read and write to the contract, will be the next scene after the WebLogin. :warning: Make sure the WebLogin scene is at the top because the order matters.

Create your contract

Open Remix IDE, install the Klaytn Remix plugin then paste the code below:

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@klaytn/contracts/KIP/token/KIP37/KIP37.sol";
import "@klaytn/contracts/utils/Counters.sol";

contract KIP37Token is KIP37 {

    mapping (uint256 => string) private _tokenURIs;
    using Counters for Counters.Counter; 
    Counters.Counter private _tokenIds; 

    constructor() KIP37("MultiTokenNFT") {} 

    function mintToken(string memory tokenURI, uint256 amount)
    public returns(uint256) { 
        uint256 newItemId = _tokenIds.current(); 
        _mint(msg.sender, newItemId, amount, "");
        _setTokenUri(newItemId, tokenURI); 
        _tokenIds.increment(); 
        return newItemId; 
    } 

    function uri(uint256 tokenId) override public view 
    returns (string memory) { 
        return(_tokenURIs[tokenId]); 
    } 
    
    function _setTokenUri(uint256 tokenId, string memory tokenURI)
    private {
         _tokenURIs[tokenId] = tokenURI; 
    } 
}

Compile your contract and deploy it to baobab testnet faucet here.

Create your C# script on Unity

Under Project window, right-click on Scenes, click on Create → C# Script

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using System.Numerics;
using UnityEngine.UI;
using Newtonsoft.Json;
public class MintKIP37 : MonoBehaviour
{
    string chain = "klaytn";
    string network = "testnet";
    private string contract = "0x02476ac12EAED5d237dd03100aF430A7a378a3DE";
    private readonly string abi = "[{\"inputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\",\"signature\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bool\",\"name\":\"approved\",\"type\":\"bool\"}],\"name\":\"ApprovalForAll\",\"type\":\"event\",\"signature\":\"0x17307eab39ab6107e8899845ad3d59bd9653f200f220920489ca2b5937696c31\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256[]\",\"name\":\"ids\",\"type\":\"uint256[]\"},{\"indexed\":false,\"internalType\":\"uint256[]\",\"name\":\"amounts\",\"type\":\"uint256[]\"}],\"name\":\"TransferBatch\",\"type\":\"event\",\"signature\":\"0x4a39dc06d4c0dbc64b70af90fd698a233a518aa5d07e595d983b8c0526c8f7fb\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"id\",\"type\":\"uint256\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"TransferSingle\",\"type\":\"event\",\"signature\":\"0xc3d58168c5ae7397731d063d5bbf3d657854427343f4c083240f7aacaa2d0f62\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"string\",\"name\":\"value\",\"type\":\"string\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"id\",\"type\":\"uint256\"}],\"name\":\"URI\",\"type\":\"event\",\"signature\":\"0x6bb7ff708619ba0610cba295a58592e0451dee2622938c8755667688daf3529b\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"id\",\"type\":\"uint256\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x00fdd58e\"},{\"inputs\":[{\"internalType\":\"address[]\",\"name\":\"owners\",\"type\":\"address[]\"},{\"internalType\":\"uint256[]\",\"name\":\"ids\",\"type\":\"uint256[]\"}],\"name\":\"balanceOfBatch\",\"outputs\":[{\"internalType\":\"uint256[]\",\"name\":\"\",\"type\":\"uint256[]\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x4e1273f4\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"}],\"name\":\"isApprovedForAll\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0xe985e9c5\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256[]\",\"name\":\"ids\",\"type\":\"uint256[]\"},{\"internalType\":\"uint256[]\",\"name\":\"amounts\",\"type\":\"uint256[]\"},{\"internalType\":\"bytes\",\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"safeBatchTransferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0x2eb2c2d6\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"id\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"},{\"internalType\":\"bytes\",\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"safeTransferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0xf242432a\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"},{\"internalType\":\"bool\",\"name\":\"approved\",\"type\":\"bool\"}],\"name\":\"setApprovalForAll\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0xa22cb465\"},{\"inputs\":[{\"internalType\":\"bytes4\",\"name\":\"interfaceId\",\"type\":\"bytes4\"}],\"name\":\"supportsInterface\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x01ffc9a7\"},{\"inputs\":[{\"internalType\":\"string\",\"name\":\"tokenURI\",\"type\":\"string\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"mintToken\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\",\"signature\":\"0xc046372c\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"uri\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\",\"constant\":true,\"signature\":\"0x0e89341c\"}]";
    string rpc = "https://public-node-api.klaytnapi.com/v1/baobab";
    private string tokenURI = "https://ipfs.infura.io/ipfs/QmbmNhqKt7mnmFeKE17QwR5s2cTnfskQKDpx8UHwfbHx3v";
    private string amount = "10";

    // AddValue is called before the first frame update
    async public void MintToken()
    {
        string method = "mintToken";
        string[] obj = {tokenURI, amount};
        string args = JsonConvert.SerializeObject(obj);
        string value = "";
        string gasLimit = "1000000";
        string gasPrice = "250000000000";

        try 
        {
            string response = await Web3GL.SendContract(method, abi, contract, args, value, gasLimit, gasPrice);
            Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }

    async public void BalanceOf()
    {
        string method = "balanceOf";
        string owner = "0x7b9b65d4ee2fd57fc0dcfb3534938d31f63cba65";
        string id = "0";
        string[] obj = {owner, id};
        string args = JsonConvert.SerializeObject(obj);
        try
        {
            string response = await EVM.Call(chain, network, contract, abi, method, args, rpc);
            Debug.Log(response);
        } catch(Exception e) 
        {
            Debug.LogException(e, this);
        }
    }
}

Create the buttons

We will create 2 buttons (Balance, Mint) on the UI to interact with our KIP37 token. To create the buttons, follow the steps in the section Custom Interaction with Login.

Test the balanceOf method

Click on ▶️ to run the program and test the Balance button

You should get a result from the Owner and the Id of the token that we put in the script

Build and Run the project to test the mint method

Go to File → Build and Run

Click on Login to connect Metamask

Click on the mint button

Confirm your transaction

Here are the details of the transaction on Klaytnscope

Files

Unity-SDK.md

Latest commit

History

Unity-SDK.md

File metadata and controls

Unity SDK Integration

Overview

Key features

Installation

Developer Environment

ChainSafe SDK

Unity Hub

Activate your license

Before you start

Klaytn Gas Fee

Klaytn RPC URL and Chain ID

ABI formatting

Solving System.ComponentModel.Win32Exception Error

Solving the Newtonsoft Error

Create a new Unity Project

Custom Call

Create your C# script on Unity

Custom Interaction with Login

Use the WebLogin prefab to enable web3 wallet connection

Create your contract

Create your C# script on Unity

Create the buttons

How to use the KIP7 token

Use the WebLogin prefab to enable web3 wallet connection

Create your contract

Create your C# script on Unity

Test the Transfer and the Mint function

How to use the KIP17 token

Use the WebLogin prefab to enable web3 wallet connection

Create your contract

Create your C# script on Unity

Create the buttons

Build and Run the project

How to use the KIP37 token

Use the WebLogin prefab to enable web3 wallet connection

Create your contract

Create your C# script on Unity

Create the buttons

Test the balanceOf method

Build and Run the project to test the mint method