Smart Contract Template To Mint An NFT With Only Native ERC-20/BEP-20 Token

Solidity Programming
#1

Please share your templates. Ideally would like to have a royalty fee attached as well.

#2

What do you think about this code?

// SPDX-License-Identifier: MIT LICENSE

import “@openzeppelin/contracts/access/Ownable.sol”;
import “@openzeppelin/contracts/token/ERC20/IERC20.sol”;
import “@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol”;

pragma solidity ^0.8.0;

contract Collection is ERC721Enumerable, Ownable {

struct TokenInfo {
    IERC20 paytoken;
    uint256 costvalue;
}

TokenInfo[] public AllowedCrypto;

using Strings for uint256;
string public baseURI;
string public baseExtension = ".json";
uint256 public maxSupply = 1000;
uint256 public maxMintAmount = 5;
bool public paused = false;

constructor() ERC721("Net2Dev NFT Collection", "N2D") {}

function addCurrency(
    IERC20 _paytoken,
    uint256 _costvalue
) public onlyOwner {
    AllowedCrypto.push(
        TokenInfo({
            paytoken: _paytoken,
            costvalue: _costvalue
        })
    );
}

function _baseURI() internal view virtual override returns (string memory) {
return "ipfs://EE5MmqVp5MmqVp7ZRMBBizicVh9ficVh9fjUofWicVh9f/";

}

function mint(address _to, uint256 _mintAmount, uint256 _pid) public payable {
    TokenInfo storage tokens = AllowedCrypto[_pid];
    IERC20 paytoken;
    paytoken = tokens.paytoken;
    uint256 cost;
    cost = tokens.costvalue;
    uint256 supply = totalSupply();
    require(!paused);
    require(_mintAmount > 0);
    require(_mintAmount <= maxMintAmount);
    require(supply + _mintAmount <= maxSupply);
        
        if (msg.sender != owner()) {
        require(msg.value == cost * _mintAmount, "Not enough balance to complete transaction.");
        }
        
        for (uint256 i = 1; i <= _mintAmount; i++) {
            paytoken.transferFrom(msg.sender, address(this), cost);
            _safeMint(_to, supply + i);
        }
    }

    function walletOfOwner(address _owner)
    public
    view
    returns (uint256[] memory)
    {
        uint256 ownerTokenCount = balanceOf(_owner);
        uint256[] memory tokenIds = new uint256[](ownerTokenCount);
        for (uint256 i; i < ownerTokenCount; i++) {
            tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
        }
        return tokenIds;
    }

    
    function tokenURI(uint256 tokenId)
    public
    view
    virtual
    override
    returns (string memory) {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
            );
            
            string memory currentBaseURI = _baseURI();
            return
            bytes(currentBaseURI).length > 0 
            ? string(abi.encodePacked(currentBaseURI, tokenId.toString(), baseExtension))
            : "";
    }
    // only owner
    
    function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner() {
        maxMintAmount = _newmaxMintAmount;
    }
    
    function setBaseURI(string memory _newBaseURI) public onlyOwner() {
        baseURI = _newBaseURI;
    }
    
    function setBaseExtension(string memory _newBaseExtension) public onlyOwner() {
        baseExtension = _newBaseExtension;
    }
    
    function pause(bool _state) public onlyOwner() {
        paused = _state;
    }
    
    function withdraw(uint256 _pid) public payable onlyOwner() {
        TokenInfo storage tokens = AllowedCrypto[_pid];
        IERC20 paytoken;
        paytoken = tokens.paytoken;
        paytoken.transfer(msg.sender, paytoken.balanceOf(address(this)));
    }

}