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first_steps_erc1155...001_use_erc1155.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;


// Owner = 0x14723A09ACff6D2A60DcdF7aA4AFf308FDDC160C
// Receiver = 0x4B0897b0513fdC7C541B6d9D7E929C4e5364D2dB
// Operator = 0x583031D1113aD414F02576BD6afaBfb302140225

import "@openzeppelin/contracts@4.5.0/token/ERC1155/ERC1155.sol";

contract CustomERC1155 is ERC1155 {
    uint256 public constant GOLD = 0;
    uint256 public constant SILVER = 1;
    uint256 public constant THORS_HAMMER = 2;
    uint256 public constant SWORD = 3;
    uint256 public constant SHIELD = 4;
    
    constructor() ERC1155("https://game.example/api/item/{id}.json") {
        _mint(msg.sender, GOLD, 10**18, "");
        _mint(msg.sender, SILVER, 10**27, "");
        _mint(msg.sender, THORS_HAMMER, 1, "");
        _mint(msg.sender, SWORD, 10**9, "");
        _mint(msg.sender, SHIELD, 10**18, "");
    }
}