Doesn't always confirm the payment method! I wanted to check I had enough Google play credit to purchase an audio book before confirming the purchase (I had £5.25, book on promotion was £5.40) - as I had insufficient funds it would be charged to my PayPal. After adding enough credit from my play points (I now had £6.40). I went to check again but instead of confirming I had enough play credit I was charged via PayPal *without* confirmation and *without* using any Google play credit. Do not use.