Subscription rules confuse me

No

Each ClientID can create three ACTIVE subscriptions to the same topic

When you renew the subscription, it basically extends the expire time on the subscription.

A subscription to a topic is defined by it’s ClientID/Topic/CallbackURL

If you subscribe to topic A with Callback B with lease time 10 days this will be defined as Subscription foo
Then 9 days later, if you subscribe to topic A with Callback B with lease time 10 days, it it’ll reset the Subscription foo expires date another 10 days (from the time the request was made). IE replacing the subscription with the new subscription

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