Can I pay in shops with my iPhone 6 Plus via NFC using Apple Pay? Has the "Apple Pay" service been launched yet? I have googled before asking the question but had no results.

I would like to try the technology to pay a small amount at KFC using iPhone 6 Plus.
On http://www.apple.com/iphone-6/apple-pay/ it says "Coming in October".

[UPDATE]

Now that Apple Pay has launched, refer to Countries and regions that support Apple Pay for the most up-to-date listing of where it's supported.