In your Node.js environment, run npm init to initialize the app.

Open the package.json file, and update the dependencies tag to the following:

{
 ...........
"dependencies": {
        "body-parser": "^1.19.0",
        "express": "^4.17.1",  
        "fabric-ca-client": "~1.4.0",
        "fabric-network": "^1.4.4",
        "fs": "0.0.1-security",
        "ipfs-http-client": "^40.0.0",
        "pg": "^7.14.0",    
    }
........
}

Run npm install to install the dependencies.

Create two files: TransListener-BankA.js and TransListener-BankB.js.

Let's start writing the code for TransListener-BankA.js.