web3-starter-sol/advanced_knowledge/wallets/send_tx_multisig.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

contract TestContract {
    uint public i;

    function callMe(uint j) public {
        i += j;
    }

    function getData() public pure returns (bytes memory) {
        return abi.encodeWithSignature("callMe(uint256)", 123);
    }
}