eBay

I have enabled GSP for a listing, but it does not display as such. There is no feedback from the site as to why. How can I find out what is stopping it from listing successfully with GSP?

When fulfilling a GSP order, can I give the supplier's tracking number to the GSP shipping center somehow, so that they know that way where the parcel is headed? All the guides I have read advises to use the eBay labels, but I'm hoping to avoid havin...