Error this API project is not authorized to use this API. Please Ensure this API is activated in the Console
<p>I have created an android project that make use of Google Places API. Once I send request for the nearest places am getting this error: </p>

<blockquote>
  <p>Error This API project is not authorized to use this API. Please Ensure this API is activated in the Console</p>
</blockquote>

<p>I have already enabled Google Places api for Android and am using browser API key. My question is How do I activate my API? Or is it supposed to be purchased?</p>