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Prerequisite You should have installed Solidity Compiler (version 0.8.2 or higher).
Step 1. Install NoRamp’s ERC721N SDK to use the contract easily in your project: 
yarn add -D erc721n
Step 2. Add the following code to your frontend: 
pragma solidity ^0.8.2;

import "erc721n/contracts/ERC721N.sol";

contract ERC721NTest is ERC721N {
    constructor(IERC20 _erc20Token) ERC721N(_erc20Token) {
        reserveTokenAddress = _erc20Token;
    }

    function mint(address to, uint256 amount) external {
        safeMint(to, amount);
    }
}