This code contains a basic view controller that interacts with PassKit to take an Apple Pay payment. It does not link up to any payment processor and therefore stops after receiving the encrypted 3DS data from Apple. It should be viewed as a Swift example of how to do a raw Apple Pay payment on the client side. For the code to decrypt the data server side see (https://github.com/beatty/applepay_crypto_demo)

One important step is that you must register a Merchant ID in the certificate section of your iOS developer portal. This exact Merchant ID string must be used in both the ViewController and the Entitlements file.