    function createReferralCode(bytes32 _hash) external {
        require(_referral[_hash] == address(0), "Referral code already exists");
        _referral[_hash] = _msgSender();
        emit ReferralCreated(_msgSender(), _hash);
    }
    function getRef(
        address _trader
    ) external view returns(address) {
        return referrals.getReferral(referrals.getReferred(_trader));
    }
