Excluding / including extra attributes for eBay
(Extra) data attributes can be very useful to for example filter based on "margin" or to flag if a product (and with what fulfillment) has to be exported to a channel or not. However, some of these attributes are not suited to be publicly displayed.
If you want to exclude any (or all) of these extra data attributes, got to the Channel Settings > Setup and scroll down to 'Extra fields to export'.
In that dropdown select or unselect the attributes you want to have exported to eBay. Extra data fields are listed as aspects below your product listing on eBay. Please note: eBay has a limit of 20 attributes / fields that can be included on a product listing, so if you have a lot of extra information make sure you select the most relevant ones.