Depends on the scratch - most have their own situation. Best way is to have it repainted, but if it is not that bad, you might be able to do it yourself.

If you can find one of those small touch up bottles that match your paint, you can use it and then wetsand the scratch to get it to blend in. Once you have the scratch blended and sanded, then polish and wax it. I have done a few this way on different vehicles. If you take your time, and the scratch is not too terribly bad, you can blend it well enough it is not too noticeable.

Might be worth a try anyway before you pay someone else to fix it.