Photoshop Batch Background Script

I have a folder full of JPEG shots that all need the same treatment: drop the existing backdrop, replace it with a clean white one, flatten, and write the result out as a new JPEG into a second folder while keeping the original file names intact... (Budget: $250 - $750 USD, Jobs: Adobe Creative Cloud, Adobe Photoshop, Image Processing, JavaScript, Photo Editing, Photoshop, PHP, Scripting)