How do you usually pay for a new car at the dealership?

Hello, soon my new one comes. Now I ask myself, how do I pay with the least risk. I transfer, dealer sends me the letter to register and I pick up the car afterwards. Is this the usual practice at a serious car dealership? What if the letter does not come after the transfer, can I have my money back easily and if, how long? Are there any stumble traps, what should I pay attention to? Greeting sand