Integrate Apple Pay®

This document provides a guide to integrating Apple Pay into your web applications. PaywayWS provides the RESTful web service with which you will interact to implement your Apple Pay interface.

Apple Pay provides a secure, wallet-based payment method for your users. The actual integration is done in a JavaScript that we provide to you and you can customize to your needs.

I. Apple Pay and 3DSecure
To use Apple Pay, a user must register a credit card in the wallet on their Apple device.
When this process is complete, the card is registered on a 3DSecure token server and the
related account number and OnlinePaymentCryptogram is stored securely on the phone.
Note that the account number on the wallet entry is not the same as the credit card
account number. The data from the wallet on the Apple device is what Payway® sends to
the card processor. The processor then interacts with the token server to acquire the
original credit card PAN, and the transaction is processed.

II. Integration Methods
There are two ways to integrate Apple Pay transactions with Payway.

A. Using Payway Apple Pay JavaScript
Our JavaScript contains all the logic necessary to communicate with PaywayWS,
decrypt Apple Pay payloads, and process payments. We take care of all the
cryptography and certifications with Apple Pay. We provide you with a standard
JavaScript which you can then modify to support your own payment sheet that is
displayed to the user.

B. PaywayWS Apple Pay Cryptogram Requests
In some cases, our partners choose to implement their own Apple Pay integration.
This requires managing of the Apple Pay merchants, processors, certificates, etc. In
this mode you will send decrypted Apple Pay payloads directly to PaywayWS for
processing. See the PaywayWS document for information on the
ApplePayCryptogram account entry type. The remainder of this document describes
the steps required to integrate with the Apple Pay JavaScript discussed in the previous

III. Integration Steps for Processing Payway Apple Pay
Processing an Apple Pay payment is done in four steps. The first step and the final step are
executed from your server and are completed via PaywayWS requests. Step 2 and 3 are
handled in the Apple Pay JavaScript. The steps are described in the sections below. Note
that the first and last steps are executing from your server to the Payway® server. These
steps include data that is not sent to the browser. During an Apple Pay transaction only
the transaction token, transaction result code, and any error message is available to the
browser. The transaction token is described later in this section.
Below is a block diagram of the steps for an Apple Pay transaction. Note the two middle
steps on the left side are initiated by the JavaScript that we provide for integration.

apple pay 1



A. Step One: Queue Transaction
Before presenting the page with the Apple Pay button, you will send PaywayWS a
request to queue a payment. This request will return a paywayTransactionToken that
will be sent to the browser and used to complete the payment. The transaction token
is like a PaywayWS session token except that it can be used only to interact with the
queued transaction. This allows us to send to the browser this transaction token
without concern for hijacking a Payway session. The queued payment includes the
payment amount, source id, and payment type. Once this step is completed the Apple
Pay button can be displayed on your page. See the PaywayWS integration guide and
the sample application for more on sending the queue payment request.

B. Step Two: Validate Apple Pay Merchant
When the user presses the Apple Pay button on your page, the Apple Pay payment
sheet is displayed and a request is sent to PaywayWS to validate Payway® as a valid
Apple Pay provider. The payment sheet is ready to accept payment authorization from
the user.

C. Step Three: Authorize Apple Pay Payment
Depending on your customized modifications to the JavaScript, the user may interact
with the payment sheet by modifying certain fields. When the user authorizes the
payment, the JavaScript will send the encrypted Apple Pay information to PaywayWS
for processing. The results are processed by the JavaScript. In the sample code the
JavaScript posts the results to a confirmation page. You will need to interpret the
results and take appropriate action. Note that the JavaScript sends the transaction
token to refer to the payment that was queued in step 1. Only the transaction token is
available to the browser and the transaction token can be used only to send the
queued transaction and read the results.

D. Step Four: Query Transaction Details
In response to the request to send the queued transaction (sendQueuedTransaction
PaywayWS request), PaywayWS returns the result code and any error message. This
may be all you need to complete the transaction. Optionally you can query the
transaction details by sending a request to PaywayWS, getPaymentDetails. An
example of this is in the sample application, the TransactionDetails.jsp page. This will
return all fields for the payment and account records, with PAN data masked.
At this point you can store and/or present any of this information to the user for
receipt purposes or other processing. This interaction is between your server and
PaywayWS so none of this information is available to the browser during the

IV. Managing Payway Transactions
The Payway Apple Pay integration uses the PaywayWS RESTful API to validate Apple Pay
merchants and perform Apple Pay transactions. To manage your transactions, you can
use PaywayWS requests. These include reading transactions and updating user accounts
where needed. Reports and other payment management functionality is provided by the
Payway web application.
V. Sample Application
There is a sample application in the form of .jsp pages and a JavaScript. The following
files constitute the sample application. The files are commented on to explain each step
and indicate where you can customize the JavaScript for your needs.

apple pay2

VI. Apple®, Inc. Requirements for Apple Pay
Apple has requirements for the look and feel of the button, placement of the button, and
interaction with the payment sheet. Refer to Apple’s web site for integration guides
including Apple requirements on presenting the Apple Pay button.