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The Journey of Apple Pay at JUST EAT

The original post is published on the JUST EAT tech blog at the following URL http://tech.just-eat.com/2015/07/14/the-journey-of-apple-pay-at-just-eat/

Introduction

Apple Pay has recently been released in UK and at JUST EAT we worked on the integration in the iOS app to better support all of our customers and to ease the experience to both existing and new users. Until version 10 of our iOS UK app, the checkout for completing an order was wrapped into a webview and the flow was as follows:

biscuit

Since Apple pushes developers to implement Apple Pay in a way that the checkout doesn’t force the user to log in, the checkout flow had to be reworked, and we took the opportunity to make the majority of the checkout flow native. This enabled us to support both checkout flows:

  • standard checkout (now with a more native flavour)

biscuit

  • Apple Pay checkout

biscuit

The latter is clearly a fantastic solution for completing the checkout in very few steps with a great and simple UX. Thanks to the information provided by Apple Pay (inserted by the user when registering a debit/credit card) the user details native screen is no longer necessary and more importantly for the user, there is no need to log in to the platform.

A further detail on the checkout is that we support two different so-called “service types” for the orders: delivery and collection. Defined as so:

typedef NS_ENUM(NSUInteger, JEServiceType)
{
    JEServiceTypeUnknown = 0,
    JEServiceTypeDelivery,
    JEServiceTypeCollection
};

On a side note, these changes soon became a challenge during the development as JUST EAT need to treat Apple Pay users (guest users) in a similar manner to users that have registered previously to our service.

How we designed around Apple Pay

At the time of writing there are already a few very good articles about a basic integration with Apple Pay. Probably the best reference worth mentioning is the NSHipster post.

Clearly also the Apple Documentation is a great start and the “Apple Pay Within Apps” video from WWDC 2015 explains really clearly all the relevant steps to have your app ready for Apple Pay.

Rather than discussing the basic concepts (creating the merchant ID, configuring the PKPaymentRequest object, handling the presentation of the PKPaymentAuthorizationViewController, sending the token to the Payment Service Provider, etc.), we think it’d be more useful to walk you through the architectural aspects we considered when designing the solution on iOS using Objective-C.

In the architecture we are proposing, the relevant components for handling an Apple Pay payment are the following:

  • ApplePayService
  • ApplePayPaymentHandler
  • ApplePayPaymentRequestFactory

Some additional components are also present in the big picture:

  • CheckoutService
  • ABRecordRefConverter
  • PaymentFlowController

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