The Gunbroker add-on is a great feature that will sync your e-commerce site with your account. There will be 2 parts to setup before you can begin using this add-on.
Navigate to SYSTEM > CONFIGURATION. On the left scroll towards the bottom until you see the section labeled "Gunbroker" and select "Gunbroker API - Settings."
1. Expand the "Live/Stage tab." Set System to Live API
2. Expand "Live API - Settings" and enter your Gunbroker username and password.
For the API-Key field, enter: 904efc31-411a-4a93-92fe-67b2fce346d5
3. Expand "System Settings." Enter your zip code and click Synchronize.
**Sandbox API Settings is used for testing purposes.
Navigate to CATALOG > MANAGE PRODUCTS
Use the search filters to find the product that you'd like to feature on your Gunbroker account.
Click and open the product.
On the left find the "Gunbroker" tab and expand the tab to view all the available settings.
Set the terms for the Gunbroker auction