Google AdSense pin is the code that Google sends to verify your billing address. Many people complain that they have not received Google AdSense PIN which may be due to countries location or posts offices services.
You have three or four tries to get your PIN – the first being issued automatically after you reach the threshold, the remaining 2 or 3 you need to request. If you still don’t receive it, You will need to wait until 30 days. After the last PIN was requested, you will be able to upload documents (if that option is available in your country) or request another PIN.

Note 1: The link to request a new PIN will appear in your AdSense account about 4 weeks after the last PIN was issued. (Before requesting a new PIN, make sure your payment address is correct. Learn how to change your payment address.)

Note 2: If you have not received your PIN after 3 attempts, then try the PIN troubleshooter it should lead you to a contact form or will send you another PIN.

Note 3: If you fail to receive your 4th PIN, only then the PIN troubleshooter should lead you to a contact form (there you will be able to upload documents if that option is available in your country) else it will send you another PIN. (If the document verification form is not available for you then the only way to verify addresses now is to receive a PIN successfully.)

Note 4: The PIN is sent by regular mail. There is no tracking for standard postal services.