The Affiliate Window Banners plugin uses the V3 api to load related products into your sidebar widget. You will need to have signed up as an affiliate
Manual install: Unzip the file into your WordPress plugin-directory. Activate the plugin in wp-admin.
Install through WordPress admin: Go to Plugins > Add New. Search for "Affiliate Window Banners". Locate the plugin in the search results. Click "Install now". Click "Activate".
Go to the settings page and add your Affiliate windows id number and the V3 password. In your Affiliate Window api credentials page you will see a number of option - you want the V3 password only.
You can then set the default site wide keywords that will be used if you do not set one for each post or page. This plugin will only work with wordpress pages and posts. It is not yet custom post enabled.
You can also set the number of products to display in your side bar and also the nmber of characters to display as the description. Obviously the description can only display if there is enough characters available in the api feed.
When you add new posts or pages or edit existing ones you will see a new meta-box in the edit page to allow you to set keywords for individual pages and posts. This will over-write the default keyword option for that page.