Sorry, not the best at posting via phone.

I don't know how this works when shipping to places where this service isn't an option.

Buyer/seller protection can apply to off eBay sales as well. From:

"1. Your order never arrives
All you have to do is log in to your account and open a dispute to get the refund process started. And if you made the purchase on eBay, start here instead."

Now, how to protect yourself as a seller is elsewhere. Here is their summary of cases where sellers are and aren't covered: