If you have an Amazon professional seller account, you can sync your MWS account with ASellerTool.
If your MWS account has never being synced with ASellerTool before, you will have one month professional plan to try our service out. You can only associate one AST user ID with your MWS account. If you have another user ID (phone) to access FBAScan app, you can not sign up the same MWS account. You need to sign up a subscription to activate the service.
By sync your MWS account with ASellerTool, you can also use our FBAListing software to do MF or FBA listing.