Product feed import
See here for the basics about product feeds.
A product feed needs to contain all the products that can be purchased at all of a retailer's locations (e-commerce web sites or local shops) and be in a single master language.
It might be wise to let the PIM (Product Information Management) system generate the product feed XML file rather than the web shop.
Note
When migrating historical transactions, the product feed won’t be able to add metadata, since the feed normally contains current data (e-com does not need “old” data to be sent out to, for example, Google Shopping). Therefore, you might end up missing historical data. In some cases, a separate migration is recommended. Talk to your Engage team about the best approach.