PS AR Billing

AR/BI functional overview needed (High level)

Hi all! I've got an intereview on Monday for a Perm position supporting AR/BI at my current client. Slight issue--I've never done anything supporting AR/BI before. I've spent the past 4 years supporting Project Costing and Financials data validation tables. Prior to that I had 8+ years supporting various aspects of HR/Ben.