GSN Enabled Solidity Contract

Counter-GSNEnabled.sol

pragma solidity ^0.5.0;

import "@openzeppelin/contracts-ethereum-package/contracts/GSN/GSNRecipient.sol";

contract Counter is GSNRecipient {
 uint256 public value;

 function increase() public {
 value += 1;
 }

 function acceptRelayedCall(
 address relay,
 address from,
 bytes calldata encodedFunction,
 uint256 transactionFee,
 uint256 gasPrice,
 uint256 gasLimit,
 uint256 nonce,
 bytes calldata approvalData,
 uint256 maxPossibleCharge
 ) external view returns (uint256, bytes memory) {
 return _approveRelayedCall();
 }
}