sub-mgr-2.sol

    event SubscriptionCreated(address indexed from, address indexed to, uint256 subscriptionId, Subscription subscription);
    event SubscriptionCanceled(uint256 indexed subscriptionId);
    event Payout(uint256 indexed subscriptionId, uint256 amount, address token);

    function createSubscription(address receiver, uint256 amount, uint256 payoutPeriod, address token) external {
        Subscription memory newSub = Subscription(
            msg.sender,
            receiver,
            amount,
            token,
            payoutPeriod,
            true,
            0
        );
        subscriptions[subscriptionCounter] = newSub;
        subscriptionCounter += 1;
        emit SubscriptionCreated(newSub.payer, newSub.receiver, subscriptionCounter - 1, newSub);
    }