The system should allow users to purchase multiple subscriptions in advance.
Expected behavior:
- A user can purchase a new subscription even if they already have an active one.
- If a second subscription is purchased while the first one is still active, the current subscription should remain active until it expires.
- The current subscription's automatic renewal should be canceled.
- Once the first subscription expires, the next purchased subscription should automatically become active.
- This process should continue for any additional queued subscriptions.
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