Dear Sir,
I used to work on eBay API and have done similar projects on this area, I can show you the demo for all of your needs that you mentioned on project description.
Relevant Skills and Experience
I have done many similar projects, I can show you the demo of my work
Proposed Milestones
$500 USD - Progress
$1000 USD - Finalize & setup
Do youhave eBay developer keys and token?