tokenizing agreement with hashes and payables

TokenWarrant.sol

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import 'https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC1155.sol';

contract TokenWarrant is ERC1155 {
    mapping(uint256 => string) public metas;

    function uri(uint256 id) public override view returns (string memory) {
        return metas[id];
    }

    function createAgreement(address investor, uint256 id, string calldata agreement) external payable {
        metas[id] = agreement;
        _mint(investor, id, msg.value, '');
    }
}