Handle Onsite Transaction Checkout from Frontend Using Metamask API and Javascript

Apart from Web3 modules at the backend of handling Cryptocurrency wallet checkout, MetaMask API provides a way for developers to add a way to complete the full checkout process at the front end. Therefore, customers just need to click the favorite item checkout button, fill in the amount in their wallet and sign. The checkout is done.

In this article, I would briefly walk through how to leverage MetaMask API using Javascript to add this function on the product detail page or product list page. So customers can click through and checkout, which shortens the conversion journey.

Table of Contents: Complete Transaction Checkout on Frontend Using Metamask API and Javascript

• Connect with MetaMask Wallet
• Buy Now Button Script Connecting with Wallet
• Receive the Order Confirmation Receipt after Customers Have Signed in.
• Full Javascript of Transaction Checkout on the Frontend Using Metamask API and Javascript
• FAQ

Connect with MetaMask Wallet

This step is similar to the last chapter regarding user sign-up and login using the MetaMask wallet. The difference is this button is for buyers to enable the connection again if it’s disconnected, or she or he hasn’t signed up yet. It can ensure your database can store this buyer’s wallet address’s public key

   //Connect the website

   let accounts = [];

   const ethereumButton = document.querySelector('.enableEthereumButton');

   ethereumButton.addEventListener('click', () => {

       getAccount();

   });

   async function getAccount() {

       accounts = await ethereum.request({ method: 'eth_requestAccounts' });

   }

Buy Now Button Script Connecting with Wallet

Once the buyer has connected with your website using MetaMask, now she or he is able to check out the item when clicking the buy now button.

For the button script that can trigger MetaMask, here is the code sample as follows:

   //Sending Ethereum to an address

   sendEthButton.addEventListener('click', () => {

       signTransaction = ethereum.request({

           method: 'eth_sendTransaction',

           params: [

               {

                   from: accounts[0], // this is the user wallet address she or he used to connect with your website just now above

                   to: 'to your merchant wallet account set in advance',

               }]

       }).then(txhash => {

           console.log(txhash);

           checkTransactionconfirmation(txhash).then(r => alert(r)); // This is for the receipt data capture. I would show more details in the following point

       });

   });

Receive the Order Confirmation Receipt after Customers Have Signed in

After the buyer has signed the order, it’s not finished yet. It’s because you need to get the confirmation receipt and respond to this dataset to your backend and automatically update the database and fulfill the order. 

   function checkTransactionconfirmation(txhash) {

       let checkTransactionLoop = () => {

           return ethereum.request({ method: 'eth_getTransactionReceipt', params: [txhash] }).then(r => {

               if (r != null) return 'confirmed';

               else return checkTransactionLoop();

           })

       };

       return checkTransactionLoop();

   }

Full Javascript of Transaction Checkout from the Frontend Using Metamask API and Javascript

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FAQ:

Q1: What is Metamask?

A: Metamask is a software cryptocurrency wallet used to interact with the Ethereum blockchain. It allows users to store and manage their Ether and other ERC-20 tokens, and interact with decentralized applications (dApps).

Q2: How does Metamask work?

A: Metamask is a browser extension that connects to the Ethereum blockchain. It allows users to create and manage Ethereum accounts, send and receive Ether and ERC-20 tokens, and interact with dApps.

Q3: What are the benefits of using Metamask?

A: Metamask is a user-friendly and secure way to interact with the Ethereum blockchain. It allows users to easily manage their Ether and ERC-20 tokens, and interact with dApps.

Q4: What are the risks of using Metamask?

A: Metamask is a secure wallet, but there are still some risks associated with using it. These risks include the potential for theft, hacking, and phishing attacks.

Q5: How can I protect myself from these risks?

A: There are a few things you can do to protect yourself from the risks of using Metamask. These include using a strong password, keeping your computer and software up to date, and being aware of phishing attacks.

Q6: What is the Metamask API?

A: The Metamask API is a set of endpoints that allow developers to interact with the Metamask wallet. This includes the ability to create and manage accounts, send and receive Ether and ERC-20 tokens, and interact with dApps.

Q7: How can I use the Metamask API?

A: You can use the Metamask API by making HTTP requests to the API endpoints. The API is documented on the Metamask website.

Q8: What are the benefits of using the Metamask API?

A: The Metamask API allows developers to easily interact with the Metamask wallet. This can be used to build dApps that interact with the Ethereum blockchain.

Q9: What are the risks of using the Metamask API?

A: The Metamask API is a powerful tool, but there are some risks associated with using it. These risks include the potential for theft, hacking, and phishing attacks.

Q10: How can I protect myself from these risks?

A: There are a few things you can do to protect yourself from the risks of using the Metamask API. These include using a strong password, keeping your computer and software up to date, and being aware of phishing attacks.