1. Please help me get this resolved because ironically, this has now happened to the same user twice and it is not good for business!

Check CBSubs > Notifications and CBSubs > History Log. Every step of CBSubs Stripe is logged to the History Log. Any and every error, warning, notice from CBSubs Stripe is designed to log. The only exception is if Stripe never made it to the gateways webhook URL.

2. Please let me know exactly which of the events the Stripe webhook needs to send to our site, such as charge.succeeded? Currently it is listening for "All Events" and I do not believe this is necessary. I need all events that would be needed for our CBSubs and not others.

These will be listed in CBSubs Stripe in the next release, but the following are all you need to listen to at this time.

charge.refunded
charge.succeeded
charge.failed
charge.dispute.created
charge.dispute.closed
payment_intent.succeeded
payment_intent.payment_failed
checkout.session.completed
invoice.payment_succeeded
invoice.payment_failed
customer.subscription.deleted

The date is fine. IPNs can't guarantee an exact datetime of when they'll come through. If you're using recurring payments you must set a Grace Period on your plans. Several payment methods could take minutes, hours, days, or weeks to process. At minimum a 3 day grace period should be set

I don't see any immediate issues in your logs though. Please PM backend super user login credentials and will see if the IPN is missing data for some reason.

There's no notifications for that basket at all. So the webhook never arrived. Within Stripe > Dashboard > Webhooks > YOUR_WEBHOOK you should see a list of webhooks sent to your site. If it failed to reach your site it should be noted there, but their webhooks are just looking for a 200 response so it's not really indicative of if we processed the webhook or not. Please be absolutely sure your webhook URL is correct AND reachable (e.g. try navigating to it manually which should just show a blank page).