Build a Cryptocurrency Payment Checkout Function for a Flask App Using Python, Infura, Metamask, and Web3

The cryptocurrency payment method facilitates merchants to receive funds from buyers to avoid strict regulations from traditional bank payments. In a way, it also can save costs in long run and facilitate business expansion by using in-house built Cryptocurrency payment methods.

In this article, I would walk through briefly how to use Python, Infura, and Web3 modules to develop a Cryptocurrency payment checkout on the website. By the end of this tutorial, you can add this on your web and let your buyers check out and send you funds through the Crypto network.

Table of Contents: Add a Cryptocurrency Payment Method to a Flask App Using Python, Infura, Metamask, and Web3 

• Arguments and value required to create a transaction
• Metamask and Infura API node to Connect Ethereum Blockchain
• Sign and send the transaction
• Flask route
• Full Python Script of a Cryptocurrency payment method creation using Infura, Metamask, and Web3
• FAQ

Arguments and value required to create a transaction

Basically, there are some must-have arguments and values in a transaction and the data format is in the dictionary. Here is the fundamental formula as follows:

transaction = {"gasPrice": gasPrice, "chainId": int(

       chain_id), "from": address, "to": receiverAddress, "value": valuetoSend, "nonce": nonce}

   gas = w3.eth.estimate_gas(transaction)

   transaction['gas'] = gas

• Sender wallet address: Buyers add her/his address by signing in to the merchant Website when checking out the item
• Receiver wallet address (It’s the merchant account by default added in Flask .env)
• Amount to pay
• Gas price: Processing price per transaction
• Chaine ID: Blockchain node ID you are connecting with
• Nonce: Transaction Count from sender pubic wallet ID
• The total cost of gas

Some argument value can be gained as follows:

• Gas price: w3.eth.gas_price
• Chain ID: https://chainlist.org/
• Nonce: w3.eth.getTransactionCount(buyer wallet address)
• Gas price: w3.eth.gas_price
• Total Cost of Gas:

gas = w3.eth.estimate_gas(transaction)

   transaction2['gas'] = gas

Metamask and Infura API node to Connect Ethereum Blockchain

I’ve shared in another article before regarding Infura API connection and Metamask usage instructions, please check out this article for more details.

https://www.easy2digital.com/web3/use-infura-and-metamask-in-python-scripts-to-deploy-web3-on-ethereum/

In the Cryptocurrency payment method added to the Flask app, this section can be added at the global level of a script that can be shared to be used in each local function. Sample as follows:

# -------------- Connect ETH network using a node: Infura -------------- ##

w3 = Web3(Web3.HTTPProvider(

   "Your API endpoint"))

gasPrice = w3.eth.gas_price

chain_id = your chain ID

private_key = os.environ.get('PRIVATE_KEY2')

def accountBalance(address):

   accountBalance = w3.eth.get_balance(address)

   return accountBalance

Sign and send the transaction

Now network connection and transaction module are ready. We can start testing the checkout from buyers.

  signed_txn = w3.eth.account.sign_transaction(

       transaction2, private_key='buyer Metamask sign-in authentication')

   tx_hash = w3.eth.send_raw_transaction(signed_txn.rawTransaction)

   tx_receipt = w3.eth.wait_for_transaction_receipt(tx_hash)

Flask route

Last but not least, we need to connect this function with the Flask main app route. The code sample is as follows:

@app.route('/', methods=['GET', 'POST'])

def web3Transaction123():

   if request.args.get('SenderAddress') and request.args.get('sendingValue'):

       prompt = request.args.get('SenderAddress')

       prompt3 = request.args.get('sendingValue')

       if request.args.get('user_signed'):

           response2 = web3Transaction(

               prompt, prompt3, request.args.get('user_signed'))

           flash("Done! Thank you for your payment")

           return render_template('test.html', response22=response2)

   return render_template('test.html')

For the user authentication using Metamas signing-in, I will share in the next article.

Full Python Script of a Cryptocurrency payment method creation using Infura, Metamask, and Web3

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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, send, and receive Ethereum-based cryptocurrencies, as well as interact with decentralized applications (dApps).

Q2: 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 methods for sending transactions, getting account balances, and interacting with dApps.

Q3: 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.

Q4: What are some of the benefits of using the Metamask API?

A: The Metamask API allows developers to easily interact with the Ethereum blockchain and dApps. This can save time and effort when developing blockchain applications.

Q5: Are there any risks associated with using the Metamask API?

A: Yes, there are some risks associated with using the Metamask API. These risks include the potential for unauthorized access to your wallet, the loss of funds due to a bug in the API, and the potential for phishing attacks.

Q6: How can I mitigate the risks associated with using the Metamask API?

A: You can mitigate the risks associated with using the Metamask API by taking the following steps: only use the API with a trusted wallet, keep your wallet software up to date, and be aware of phishing attacks.

Q7: What are some of the use cases for the Metamask API?

A: The Metamask API can be used for a variety of purposes, including: building decentralized applications, interacting with smart contracts, and managing your cryptocurrency portfolio.

Q8: Where can I learn more about the Metamask API?

A: You can learn more about the Metamask API by visiting the Metamask website, reading the API documentation, and joining the Metamask community forum.

Q9: What are some of the challenges of using the Metamask API?

A: Some of the challenges of using the Metamask API include: the need to understand the Ethereum blockchain and smart contracts, the potential for errors when using the API, and the need to keep your wallet software up to date.

Q10: What is the future of the Metamask API?

A: The future of the Metamask API is bright. As the Ethereum blockchain and dApps continue to grow in popularity, the need for a simple and easy-to-use API will increase. The Metamask API is well-positioned to meet this need.