I had an interview earlier this year and would suggest know as much as you can about eBay, all subsidiaries and its functioning.My interview pattern was behavioral with situation based questions, resume and on related projects done.
Clearly articulate “why eBay” and “why now”. Make sure you understand how eBay works - ideally buying and selling. eBay is a unique marketplace with unique challenges, the interviewer will try to judge if you understand that. Again what I state above is for business, marketing and product roles. Finance may be different.
Know the product. That's important. Buying and selling side.