New subscriber notification is triggered before the subscription is active
Description
We had a case today of a user receiving a new subscriber notification, only to find out the subscription in question didn't appear in the list. It turns out this specific subscription never reached the active status: the payment was never fully validated and it passed to incomplete_expired.
Current Behavior
The new subscriber notification is sent directly when the subscription is created.
Expected Behavior
The new subscriber notification should be sent after the subscription becomes active for the first time, making sure the customer went through the all checkout process.
Notes
This will happen only on Stripe hosted checkout where it looks like they trigger the subscription creation right after submission, without waiting for the payment to be fully validated (3DS or such).
In our Checkout implementation, the subscription is created only when the payment is complete, so this behavior shouldn't be seen.
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