Click on “Order now” sends order, even if PayPal payment is not completed

Hey there,

I have got a slight problem:

1) In the last order step, I choose “PayPal” as Payment option.
2) I ignore the PayPal button and click straight on “Buy now”.
3) a) A WooCommerce error appears “An issue with the payment appeared. Please try again”.
3) b) Woocommerce admin panel registers a “failed” order.
3) c) The customer receives an order confirmation via email, but with missing payment info.

So I would like to disable the “Buy now” button, until the PayPal-payment is confirmed.
Any idea, how I can do this?

Payment Plugin: WooCommerce PayPal Payments

Thanks in advance,

Tobias Metzger