We’ve given you many optimization tips over the years, and, as you know, it’s important to consider how your ad implementations affect not only your click-through rate, but your users’ and advertisers’ experience as well. To support this, we’d like to …

To make sure that the AdSense account details, publishers provide to Google are valid and correct, it uses two methods of verification. First one is using PIN (Personal Identification Number) and second is Phone Number verification. In the past, Google would send out a PIN mailer to publisher once the earnings in publishers account reach $50. Recently, Google lowered the threshold of $50 to $10. This change will make many publishers see a PIN arrive in their mailbox sooner, as well as a prompt in Adsense account to verify PIN / phone number.