Demo Implementation of apple pay signature verification.
This Implementation validates apple pay signature according to: https://developer.apple.com/library/ios/documentation/PassKit/Reference/PaymentTokenJSON/PaymentTokenJSON.html
The token data provided in this demo is corrupted for our security. Change it to yours. The next step after verifying the signature is data decryption. The implementation can be found at: https://github.com/beatty/applepay_crypto_demo