This morning I received a card from Google. It is the Google AdSense PIN. I remembered that my AdSense income reached over $10 last month. To my surprise, it is not very large and it came from Mountain View. After lunch I came back to my dormitory, then login to my AdSense account and entered the PIN code. The second is the telephone verification. After I entered my telephone number, in less 3 seconds, the telephone rang. I got an code from the phone and entered it in my AdSense account.
The process is very easy. This mail is the first mail that I received from Google. I hope I will receive the first earning from Google in some day.