Thank you for this article.
I want to offer my professional experience about Drop Shipping
Having a shop that took me a lot of time, I decided to go on the adventure of Drop Shipping. A priori intended to help traders in their inventory management, billing and sending, my experience has ended very badly. Delivery not sent, stock not updated, API defective, succinct support response ...
So if I can give advice, choose your provider, look at the comments and write a specification on your needs and expectations in terms of service.
See try to negotiate them.