If you are in Jordan and they invite you to have coffee, you must accept, since for them it is a show of hospitality. If you don't want to drink more, you will have to move the cup from one side to the other. This way, the host won't serve you again. You have all the information in: «Traditions of the world: cultural and social customs«.
You have all the information in: "Traditions of the world: cultural and social customs".