How to link Google Play account to a Google Developer Project
<p>I have use the google play developer console and want to set the API access. I have a google developer project before so I want to add the exist project.</p>

<p>I follow the documentation <a href="https://developers.google.com/android-publisher/getting_started#using_an_existing_api_project" rel="noreferrer">link</a>:</p>

<blockquote>
  <p>Using an existing API project</p>
  
  <p>If you are already a user of the Google Play Developer API, you can
  link to your existing API project by following these steps. If the API
  project you want to link to is not listed, verify that your Google
  Play Developer Console account is designated as an Owner, and the
  Google Play Developer API is enabled.</p>
  
  <ol>
  <li><p>Go to the API Access page on the Google Play Developer Console.</p></li>
  <li><p>Accept the API Terms of Service.</p></li>
  <li><p>Choose the project you’d like to link.</p></li>
  <li><p>Click Link.</p></li>
  </ol>
  
  <p>Your Google Play Developer Console is now linked to the API project.</p>
</blockquote>

<p>However, in my API Access page, there is only <code>Create new project</code> button, and I don't know to follow the steps to link the exist one. There is no project listed.</p>

<p>Does anyone have ideas? Thanks.</p>