Bug Users can easily create duplicate subscriptions

[PaulB]

Here’s an example with PayPal:

1. Alice subscribed to an upgrade with monthly payments.
2. For whatever reason, Alice’s bank declines the payment the following month.
3. XenForo downgrades Alice when payment lapses, as it should.
4. Alice notices that she no longer has an active upgrade and goes to the upgrade page to investigate.
5. XenForo offers to let her purchase the upgrade again. This is a bug. Alice takes this to mean that the existing subscription has been canceled. XenForo...

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