ERC-1155 Multi-Token Contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract GameItems is ERC1155, Ownable {
    uint256 public constant GOLD = 0;
    uint256 public constant SWORD = 1;
    uint256 public constant SHIELD = 2;

    constructor() ERC1155("https://game.example/api/item/{id}.json") Ownable(msg.sender) {
        _mint(msg.sender, GOLD, 10_000 ether, "");
        _mint(msg.sender, SWORD, 100, "");
        _mint(msg.sender, SHIELD, 50, "");
    }

    function mintBatch(address to, uint256[] memory ids, uint256[] memory amounts) external onlyOwner {
        _mintBatch(to, ids, amounts, "");
    }
}