Selling branded items on amazon

Hi,

Forgive me if this has been posted already, however my situation may be slightly different to some others.

I have a website selling only branded products. They come from a dropshipping supplier in the UK. I want to start selling the same items on amazon, but of course you need some kind of proof from the manufacturer that I’m allowed to sell their items.

My question is, as the manufacturer allows my supplier to sell to me (to then sell on), can an invoice / dropshipping agreement from my supplier be enough to get authorised on amazon?

Thanks in advance