If you are setting up Pro-routing of your inventory records to ABEbooks, you'll need your ABE user ID and API key. Here's how to find them!
What's my ABE user ID?
Sellers listing on ABE can find their ABE user ID and API key in their Members Menu on that site.
You can copy and paste the User ID into the Username/ID field, then paste the API key into API Key field. Don't forget to paste again or re-enter where it says Re-enter API key.