The Global Shipping Program is a program offered by eBay to US and UK sellers. The program simplifies the international shipping process, allowing international buyers to purchase products, and the sellers to then ship the products to a domestic shipping center, where it will then be shipped internationally to the buyer.
Click here to find more details about how to sell internationally on eBay.
More details about eBay's Global Shipping Program can be found here. Therefore, please check your items and verify if they qualify for Global Shipping or not before enabling them within SellerChamp.