Tax, and particularly VAT in the EU, is a real pain to deal with. Stripe does offer `tax_percent` to be added to invoices, but unfortunately this can only be added on top of the price. This means, that if I want to offer a flat price to all EU customers with VAT included, things get messy. Either I do my own tax thing separately (or via metadata), or I have to create a bunch of different subscription plans, each for every VAT rate in different EU countries...
If the `tax_percent` could be deducted from the full amount, rather than added on top, this will solve this in a much cleaner and simpler way.
Paypal integration would also be really helpful, particularly for subscriptions.