It is! Its taking way longer than I expected. We are trying to balance getting a good product out with testing and what features to come out with first.. We are almost there too! So please keep checking back here and we should be coming out with a beta shortly.. Please be sure to sign up online to be notified: Bytestand
We do have a fun explainer video we've put together that will be included in our listing in the Shopify App store. You can see it in the following link: Bytestand: FBA to Amazon
As a side note I would be very wary of providing anyone my Amazon credentials. They will be able to access any and all information within your account.
Thanks
Todd