Handling of deleted webhooks

[torotil]

If a webhook was deleted on the Stripe side for any reason, then nothing happens on our end. The only outcome is that payments never reach the payment_status_success.

Even recreating the webhook manually is a hassle:

1. Some code needs to be run to delete the old webhook data:

$m = entity_load_single("payment_method", 5);
unset($m->controller_data["webhook_key"]);
unset($m->controller_data["webhook_id"]);
entity_save("payment_method", $m);

2. Go to admin/config to load and save the payment method.

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We should think about:

• How can we detect a deleted webhook earlier?
• Should we automatically recreate the webhook? If so what should trigger that? If not should we build some reporting about this?