I've only worked with AppGameKit IAP stuff via Tier 1, but know that it never had any such feature to retrieve pricing information from Apple servers--I've not yet seen any changes to these commands in V2 either that would add such functionality.
Being able to retrieve localized product information is an
essential component of IAP when building for Apple/Google, so it is a shame this does not readily exist in AppGameKit as it leaves the IAP features incomplete. In fact, Apple specifically states that you should be querying the server for localized info about each available product before displaying to the user.
In Tier 2 you should be able to add this functionality easy enough (using SKProductsRequest for Apple) similar to adding any new libraries and components. Refer to the
Retrieving Product Information section of this link. However that may mean breaking out of the AGK-based IAP commands altogether and simply passing the necessary data to and from your AppGameKit functionality. xGekkox would be the one to talk to as he's got IAP for all his apps using Tier 2.