Don’t fall for it folks. It’s free online, and you can also do it at the airport when you land if you have problems before you leave your home country. It’s a scam
On arrival, NEVER give in to the urge to sleep. Get straight into the rhythm of whichever country you are in. I find a good shower, a nice meal and a few drinks to take me to around midnight, sorts me out. I wake up the following morning feeling fine.