XYZ Sample App
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This application is a sample integration of Google Wallet for online commerce.
It demonstrates how to integrate the API into your web application.
This sample is optimized for mobile devices but the integration model is the same for both mobile and desktop.

Prerequisites
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This project uses Maven. You need to have at least maven 3.0.x installed on your machine.
You can run mvn verify in the project source to ensure its all setup. On first load, this
command downloads the necessary artifacts/jars.

Configuration
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Under src/main/webapp/WEB-INF/appengine-web.xml specify your sandbox and production ID and auth key.

Building:
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Once you have the source, here are the set of instruction for building the project

$ mvn package

This compiles and packages up a war (Web Archive) that can be deployed to appengine.

Running a Local Dev Server:
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To run the development server locally, run the following command

$ mvn appengine:devserver

You can now visit http://localhost:8080/ in your browser to see the app in action

Updating/Uploading to App Engine:
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Before you perform this step, ensure that you have setup the correct app-version in appengine-web.xml
Replace the APP_IDENTIFIER with the one registered with appengine.google.com

 <application>APP_IDENTIFIER</application>

To upload, run the following command

$ mvn appengine:update

This creates or updates an app version

For more information on using Appengine with Maven and for other supported commands,
please visit https://developers.google.com/appengine/docs/java/tools/maven 

The important parts of this sample app.
wallet.js
  - This contains the authorization code which checks if a user has already authorized for this
  merchant to get their masked wallet.
order.vm & OrderPage.java
  - This page contains the button and the success and failure callback for that button.
confirm.vm & Confirm.java
  - This page contains a change wallet button and the corrosponding callbacks.
  - It also contains the full wallet request and the callbacks for that.
receipt.vm & ReceiptPage.java
  - This page contains the call to notifyTransactionStatus