sub-mgr-4.sol

function payoutSubscription(uint256 subscriptionId) public {
        Subscription memory sub = subscriptions[subscriptionId];
        require(sub.active, 'subscription inactive');
        require((block.timestamp - sub.lastPayout) >= sub.payoutPeriod, 'Too soon');
        subscriptions[subscriptionId].lastPayout = block.timestamp;
        require(IERC20(sub.token).transferFrom(sub.payer, sub.receiver, sub.amount), 'transfer from failed');
        emit Payout(subscriptionId, sub.amount, sub.token);
    }