hardhat.config.js

require("@nomicfoundation/hardhat-toolbox");
require("@nomiclabs/hardhat-ethers");
require('@openzeppelin/hardhat-upgrades');

// Replace "INFURA PROJECT ID" with your INFURA project id
// Go to https://infura.io/, sign up, create a new App in its dashboard, and replace "KEY" with its key
const INFURA_PROJECT_ID = "INFURA INFURA PROJECT ID";

// Replace "PRIVATE KEY" with your account private key
// To export your private key from Metamask, open Metamask and go to Account Details > Export Private Key
// Be aware of NEVER putting real Ether into testing accounts
const PRIVATE_KEY = "PRIVATE KEY";

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
  solidity: {
    version: "0.8.12",
    settings: {
      optimizer: {
        enabled: true,
        runs: 1,
      },
      viaIR: true,
    },

  },
  networks: {
    rinkeby: {
      url: `https://rinkeby.infura.io/v3/${INFURA_PROJECT_ID}`,
      accounts: [`${PRIVATE_KEY}`]
    }
  },
  etherscan: {
    // Your API key for Etherscan
    // Obtain one at https://etherscan.io/
    apiKey: "<YOUR_ETHERSCAN_API_KEY>",
  },
};