title: Is it mandatory to update my app with new Ad unit ID after moving form legacy Admob to new Admob account
body: <p>I've upgraded from old legacy <code>Admob</code> account to new Admob. In the "What to do next" section of the new <code>Admob</code> account , there is a guide : Replace legacy ad unit IDs with new IDs <a href="https://support.google.com/admob/v2/answer/6025739?hl=en" rel="nofollow">https://support.google.com/admob/v2/answer/6025739?hl=en</a> .</p>
  
  <p>I want to know that whether it is mandatory to update my apps with new Ad unit ID (of new <code>Admob</code>) instead of using Legacy Publisher ID(of legacy <code>Admob</code>) in my apps.</p>
  
  <p>What happens if i don't update my app ?</p>
  
  <p>Will the earnings(after upgrading to new <code>Admob</code>) be shown in the new <code>Admob</code> when i'm using Legacy Publisher ID(of legacy <code>Admob</code>) in my apps?</p>