I am currently working on a specification for a software component which will synchronize the product catalog of an ecommerce company with the Amazon Marketplace using Amazon MW
Yes, Product Feed is the first primary feed. You need to wait until product feed gets completed before sending out other feeds.
When You Send Product Feed, its status becomes: 1) _IN_PROGRESS_ 2) SUBMITTED 3) DONE 4) COMPLETED You must need to wait until status changes to " DONE " or "COMPLETED".
Thanks.