I just had a pretty unpleasant experience with regard to my Apple Store orders for the iPhone 6S / 6S+. Like many others, I ordered using the Apple Store app, and I paid using Apple Pay. When iOS 9 rolled out a few days later and I upgraded (full restore), I had to re-register my credit card to Apple Pay (I'm not sure if this is standard practice). Yesterday afternoon I received an e-mail that my payment had been declined - I didn't notice it earlier unfortunately. Apparently it tried to charge against the old "Device Account Number" and it didn't go through, so I had to change it for one of my orders. I had 2 orders for the iPhone 6S and 1 for the 6S+. I couldn't change the payment methods online so I called up Apple to do so. They made the change, and then the CS Rep informed me that "I had 3 orders and they would all be cancelled". There's no indication of this on the online web page (they all show "Processing..."). I had to cancel one, but I have no idea how all this is going to affect my delivery dates. This is just a heads up - I'm not sure if anyone else might be facing the same issues.