Apple pay is a revolutionary new secure method of payment. Am Ex, visa, MC and now Discover Cards are on board.
You take a picture of your CC and Apple verifies it with your bank, an encrypted number is attached to that CC, also an encrypted ID is issued to your phone. The system authenticates who you are with your finger print. It uses NFC, near field communication, a standard in contact less transactions to send an encrypted payment token to your bank to complete the transaction. In other words, in a split second the transaction occurs when you place your iPhone 6 or 6 plus to the POS machine and a press of your finger.
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