They also have stand alone repair service centers you can do walk-ins to and there’s a local one almost everywhere. Most repairs are super cheap too.
If you want to spend less money, you can even go to a third party phone store or authorized retailer though some will just ship it to the official service center if they don’t have the manpower.
One downside is if you bring a US Samsung in to one of these stores and you need critical repairs. They might not immediately have the components on them so they may have to order them in and your repair time would take longer than a domestic bought phone.
This can vary by location though as a bigger flagship center near the headquarters probably has everything but I’m not going to make a trip there just for a phone repair when I can swing by the local one just a few minutes away.