Steps

Log into your UltraCart account and then navigate:

From the Authorized Applications page, select the "Authorized Applications" tab:

Then in the configuration section that appears, give your Application a name, then select Browser Key from the drop down list for "Authentication Type",and, optionally, enter in the Allowed HTTP Referrers. Then in the permission section to the right, select both the sRead/Write permissions for the API:

Click Save to save your Browser Key.