System Server for Contactless Payment with Blockchain System

This repository is built with Javascript programming language as the basic language. The main function in this repository is to create a server for contactless payments with blockchain technology. The server that is run can run locally or publicly. it is hoped that this repository can see the server running, especially on blockchain technology. blockchain uses the Sepolia Test Network for the development of this project.

Preparation

Download or Clone this repository. After that you open it with Visual Studio Code, and type this command to install all the requirements in this repository.

npm install

If the installation requirements have been successful, you can use this command from prism to create a database using migration. The database used is PostgreSQL to store all the data in this project. Don't forget to change the PostgreSQL username [YOUR_USERNAME], password [YOUR_PASSWORD], and database name [YOUR_DATABASE_NAME] in the .env file.

DATABASE_URL="postgresql://YOUR_USERNAME:YOUR_PASSWORD@localhost:5432/YOUR_DATABASES_NAME"

npx prisma migrate dev --name init

And then you have to run this project first if you need to create a smart contract, a smart contract that is used with your wallet address. This project needs the private key of the wallet address, the url of the api key test network, and finally needs the type of the etherium network. You can fill in the values in the .env file. if you need URL_ETH_API_KEY, you can visit the link https://www.alchemy.com/ and create an account. This smart contract runs on Sepolia Network, if you are using another network, you need to change the configuration in the code.

NETWORK_ETH=USE_SEPOLIA OR USE_ANOTHER_NETWORK_BUT_RUNNING_AT_ETHEREUM_BASE
URL_ETH_API_KEY=https://eth-[NETWORK_ETH_NAME].g.alchemy.com/v2/YOUR_API_KEY
ACCOUNTS_PRIVATE_KEY=YOUR_PRIVATE_KEY_WALLET_ADDTRESS

You can use this command to run this smart contract for the first time

npx hardhat run smart_contract/deploy/deploy.js --network sepolia

You need to add the mqtt host, mqtt port, mqtt username, and mqtt password in the .env file. You can create an account at https://hivemq.com

HOST_MQTT = xxxxxxxx.hivemq.cloud
PORT_MQTT = xxxx
USERNAME_MQTT = xxxxxxxx
PASSWORD_MQTT = xxxxxxxx

Running the code

If you want to run this code, you have 2 conditions, the first condition is that you need to create a smart contract for the blockchain, you can use this command on the terminal project.

npm run dev-smart-contract

and you need to debug the code, you can use this command in the project terminal.

npm run dev-without-smart-contract

Optional Configuration at the enviroment

If you need other configurations in this environment, you can edit this environment, especially the secret key and server port.

APP_LOCAL=[dev or production]
CORS_SERVER_PRODUCTION=[dev or production]
BASE_URL_API_VERSION=[v1 or another version API]
SECRET_ACCESS_KEY_JWT=s[secret]
SECRET_REFRESH_KEY_JWT=[secret]
SECRET_SALT_BYCRPT=[10 or another value]
PORT_SERVER=[port running this server]
SECRET_KEY_ETHERS=[secret]

Tech Stack

System: JavaScript, NodeJS, Prisma, ORM