Introduction

This simple Android demo app implements Secure3D payments for Checkout.com

Running and Building

This app was built with Android Studio version 3.5.3

Overview

The app uses the Android architectural components (Navigation, ViewModel and Livedata) to put together a simple flow for the user to make a card payment.

It is basically made up of one activity with 4 fragments as shown here:

1. Input Fragment => Solicits card details

2. Card Payment Fragment => Makes the POST API call

3. Secure 3D Fragment => Webview with the Secure3D url inside it which is returned from the POST call

4. Result Fragment => Shows the result of the payment operation (a tick or a cross)

Note / to improve

• The card control and expiry date control are very basic and need improving - for example, card scheme detection could automatically be done to display the card icon.
• There is not much in the way of error checking - there is none on cvv for example and more could be done on card number and expiry date
• Strings are hardcoded
• Comments are lacking
• Regular expressions have not been tested fully - mainly for the sake of this small demo, take from a RegEx site
• Exceptions not handled correctly
• Views are basic and would need improving upon
• Loads more could be added / improved upon

Testing

There are a few demo integration tests included using the FragmentScenario class and Espresso and Mockito. Although loads more tests could be written.

Other libraries used

• RxJava
• Dagger2
• Retrofit