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About Metamask: An in-depth look at Unity plugin integration

As a developer working with Unity and MetaMask, you are probably familiar with the popular decentralized finance (DeFi) platform’s mobile wallet. However, when integrating the MetaMask Unity plugin, a common issue occurs: the user is shown different amounts of Ethereum than the plugin requests.

The problem:

In our previous example, we integrated the MetaMask Unity plugin using the provided asset store package and followed the documentation. The plugin is designed to show users the correct amount of Ether (ETH) for their wallet balance, as requested by the platform’s UI. However, in some cases, this value may not match what is set in the project settings.

The solution:

To solve this issue, let’s analyze why the MetaMask Unity plugin displays different amounts than specified. The reason for this is because of how the plugin interacts with the Ethereum blockchain and wallet balance.

When users interact with their Ethereum accounts, they are not interacting directly with your project’s wallet balance. Instead, it is an external API call that returns a specific amount of ETH that the user can transfer or withdraw from their balance. This is where things get interesting: the plugin uses this external API to retrieve the correct amount of ETH.

The Unity plugin code:

To better understand how the code works, let’s take a closer look at the Metamask Unity plugin code. We will focus on the UnityPlugin class and its OnCoinChanged event handler:

using UnityEngine;
using MetaMask.Unity;
public class UnityPlugin : MonoBehaviour
{
// ... other variables and methods ...
private void OnCoinChanged(Coin coin, ulong value)
{
// Update the wallet balance UI with the correct amount of ETH
WalletBalanceUI.instance.SetWalletBalance(coin.Name, value);
}
}

As you can see, the OnCoinChanged event handler retrieves the current coin (e.g. Ether) and its corresponding value. It then updates a UI element called WalletBalanceUI to display the correct amount of ETH.

Why different amounts are displayed:

The reason for this discrepancy is the way MetaMask Unity Plugin interacts with the Ethereum blockchain. When a user adds or withdraws funds from their account, MetaMask sends an API request to retrieve the balance data. The plugin then updates the UI element using this API response.

In our case, when we update the WalletBalanceUI instance with the correct amount of ETH, we are actually updating the user’s wallet balance on the Ethereum blockchain. However, the plugin does not automatically send a wallet balance update request to the project side.

The Fix:

To fix this, you need to make sure that when you display the user’s wallet balance on the MetaMask Unity plugin, you are using the correct amount of ETH as requested by the platform. You can do this by:

• Using a reliable API to fetch the user’s wallet balance.

• Passing the value retrieved from the project side (e.g., in OnCoinChanged) to the plugin.

Here is an updated example code snippet that demonstrates how to update the UI element with the correct amount of ETH:

“`csharp

using UnityEngine;

using MetaMask.Unity;

public class WalletBalanceUI : MonoBehaviour

{

private void OnCoinChanged(Coin coin, ulong value)

{

// Update the wallet balance UI with the correct amount of ETH

WalletBalanceDisplay.Instance.SetWalletBalance(coin.Name, value);

}

}

// Example usage in your project’s C

code:

private WalletBalanceDisplay walletBalanceDisplay;

void Start()

{

walletBalanceDisplay = GetComponent();

walletBalanceDisplay.