I don’t see the option to use the GSP anywhere in Garage Sale. It seems I am being “forced” to sell a few of my item through that program as they need a signature and USPS & FedEx will not get international signatures. Will I have to list those items directly through eBay or am I missing something in GS?
There should be a “Global” tab in the shipping settings, if the site you are listing on supports global shipping. If you don’t see it, what eBay site are you using?