Amazon marketing services are something you should not miss if you are selling products online, especially when the biggest e-commerce channel you can tap into is Amazon.com. I personally always check for product availability and pricing on Amazon before I make a purchase, and I know many other consumers have similar purchasing habits. In order to reach these consumers, many of our clients have partnered with Amazon to sell their products.
Vendor Express is the easiest and direct method among the five mentioned. For getting access to AMS, the seller needs to part of the Vendor Express program. But Headline search ads, which were only available to AMS sellers, have been made available for third-party sellers in Seller Central now!
https://www.sellerapp.com/blog/ams-amazon-marketing-services-kick-start-sales/
