XML Flow Tutorial: Getting Tokens
This tutorial demonstrates how an application gets a token for a user.
The first step is the preparatory setup that enables an application to receive user tokens. This setup is done on the eBay Developers Program site (developer.ebay.com).
The second step involves interactions between an application and a user:
- Magical Bookseller, a fictitious seller who wants to use a listing application for her eBay inventory
- MagicLister, a fictitious listing application that needs to get a token in order to help Magical Bookseller list her inventory on eBay
The application makes several API calls to eBay during the process of getting a token. When a step includes an API call, it provides a link to XML call samples in the Trading API Reference. The samples show how to perform those steps using the API.
What this Tutorial Covers
This tutorial contains the following sections:
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Complete Source Code
The API Flow tutorials use raw XML requests and responses. The XML call samples described in this tutorial can all be found in the Trading API Reference.
Before You Begin
All the calls in the tutorial are performed in the Sandbox environment, using a test user and the API Test Tool. If you want to perform the steps in this tutorial for your own application in the Sandbox, you'll need to do the following:
Requirements for this tutorial
- Join the eBay Developers Program and get your application's Sandbox keyset.
- Create your own Sandbox test user, equivalent to the testuser Magical Bookseller used in this scenario, with a Sandbox authentication token. See Creating a Test User in the eBay Features Guide for more information.
- Have an application that can respond to web-based user actions and receive responses to calls it makes to eBay servers.
The tutorial has no specific code requirements. After you log in, you can run the XML samples in the API Test Tool on the eBay Developers Program website.
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Step 1: Setting Up an Application to Receive Tokens
Typically, an application needs to be set up to receive tokens only once. The following is for Web/Server based applications. For information about Client/Desktop applications, see Client/Desktop Applications.
This section shows how the developer of MagicLister uses the screens on the Application Keys page to generate an eBay redirect URL name that MagicLister will use in the token generation process, and configure the eBay consent form that MagicLister's subscribers will use to grant MagicLister tokens.
- The developer signs in to https://go.developer.ebay.com and goes to his Application Keys page.
The Sandbox environment is used for testing, and the Production environment is used to set up an application for eBay users. In this example, we used Sandbox.
In the App ID row of the Sandbox keyset, the developer clicks User Tokens to access the Tokens page for your Sandbox keyset.
He clicks Get a Token from eBay via Your Application. In the Your eBay Sign-in Settings section, he clicks Add eBay Redirect URL.
The generated redirect URL name and the sign-in consent configuration form appear. A redirect URL name contains settings that govern:
- The content that users will see on the consent form
- Rules about how the application authenticates users and gets tokens
- Application URLs such as the AcceptURL that eBay uses to return consenting users to the application
In the form on the left, he enters the application display title and URLs that will be used in the sign-in consent form. On the right is a live preview of the consent form, which is automatically updated to reflect the entries on the left:
- Display Title: the company or application name to be displayed on the consent form.
- Your auth accepted URL: the URL to which users will be directed after they consent to the web application authenticating them.
This URL must support SSL and must use the HTTPS protocol. If your application is capable of serving web pages, you should provide your own web page and set this URL. If your application cannot serve web pages, this URL defaults to a standard eBay accept-response page (the eBay page and URL are subject to change by eBay).
- Your auth declined URL: the URL to which users are directed when they do not consent.
If your application is capable of serving web pages, you should provide your own web page and set this URL. If your application cannot serve web pages, this URL defaults to a standard eBay accept-response page (the eBay page and URL are subject to change by eBay).
When the developer is satisfied with the redirect URL name settings, he clicks the Save button.
- In the Your eBay Sign-in Branding section, the developer provides branding content for his application:
- Add Image: click the icon and upload a logo image to be displayed on the consent form.
Acceptable formats for application logos include JPG, GIF, PNG, BMP, and TIF image files. JPG is recommended. If you use PNG, it will be converted to JPG (or GIF) format. The maximum file size is 7MB. eBay Picture Services (EPS) downscales and compresses the picture to store it at the different sizes in the imageset. For best results, upload a picture that has a minimum of 1000 pixels on the longer side. You can upload multiple images, but only one can be selected to display on the consent form at a time.
- About URL: the URL at which users can learn about your application.
- Enable Application Branding: check this box to use the selected logo image and the About URL on the consent form.
- After making changes, the developer clicks Save Branding.
The MagicLister application is now set up to start getting tokens.
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Step 2: Getting a Token for a User
This section shows:
How the seller, Magical Bookseller, interacts with the application site and the eBay site to grant a token to the application.
How the application, MagicLister, fetches the token.
Magical Bookseller goes to the MagicLister site, where she clicks a Subscribe button or otherwise lets the application know that she intends to use it.
MagicLister sends a GetSessionID call to eBay, with the MagicLister redirect URL name.
This call will retrieve a SessionID that will identify Magical Bookseller after she signs in to eBay. For an example of the GetSessionID request and response, see the GetSessionID samples.
MagicLister URL-encodes the SessionID and then constructs a URL containing the SessionID and the redirect URL name, and uses this URL to send Magical Bookseller to the eBay Sandbox sign-in page.
In this scenario, the GetSessionID call was made using the API Test Tool, and the SessionID was pasted into a URL along with MagicLister's redirect URL name, in a browser window.
The URL takes this form:
Magical Bookseller signs in to eBay.
eBay sends Magical Bookseller to the user consent form that MagicLister configured in
the application settings tab, in the first section of this scenario.
When Magical Bookseller clicks the I agree button, eBay sends her to MagicLister's "auth accepted" URL.
When Magical Bookseller arrives at the "auth accepted" URL, MagicLister sends a FetchToken request to eBay with the SessionID. FetchToken retrieves the token.
Notice that MagicLister includes its credentials with this FetchToken call — the App ID, the Dev ID,
and the Cert ID. That's because this is one of the few authenticated user-related calls that you make when you
don't already have a token. If you're using SOAP, the credentials need to be in the SOAP header; for XML you
include them in the RequesterCredentials field in the request body. For more information about how this works, see Authenticating with a Full Keyset and Session ID on the Trading API's Making a Call page.
FetchToken returns a user token for Magical Bookseller to MagicLister.
MagicLister saves the token and the token expiration date from the FetchToken response.
MagicLister tests the token by making a GeteBayOfficialTime request using the new token.
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Notes and Next Steps
This section contains notes about the tutorial and suggestions for extending it.
Here are some suggestions for ways you could modify or extend the tutorial to learn more about the API:
eBay Knowledge Base includes applications that incorporate the process of getting user tokens. The applications are here:
More information about the Trading API is available at these locations:
Copyright © 2009–2015 eBay, Inc. All rights reserved. This documentation and the API may only be used in accordance with the eBay Developers Program and API License Agreement.