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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IGmpReceiver {
function onGmpReceived(bytes32 id, uint128 network, bytes32 source, bytes calldata payload)
external
payable
returns (bytes32);
}

contract Counter is IGmpReceiver {
address private immutable _gateway;
uint256 public number;

// example gw 0x7702eD777B5d6259483baAD0FE8b9083eF937E2A
constructor(address gateway) {
_gateway = gateway;
}

function onGmpReceived(bytes32, uint128, bytes32, bytes calldata) external payable returns (bytes32) {
require(msg.sender == _gateway, "unauthorized");
number++;
return bytes32(number);
}
}