I can't tell you what it is because I don't have access to it. But I can tell you where to find it.
Go to akeebabackup.com, look at the menu in the black stripe at the top of the screen. Find "add-on download IDs" and click it. Your main ID is highlighted, any additional IDs that you have created are also shown there.
Dale L. Brackin
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!