Perform the following steps to enable these APIs.

1. Click ENABLEAPISANDSERVICES on your dashboard.
   
   
   A new page named API Library appears. Next, proceed to Step 2. Alternatively, you can follow these steps to visit the API Library page.
   1. Go to Navigation Menu on the Google Cloud Platform.
   2. Click API&Services and from the list of services.
   3.  select Library.
      
2. An API library page appears.
3.  Perform any of the following actions to select the required APIs.
   • On the left-hand side of the page, select a category. For example, select Email from the Category if you want to enable Gmail API. Then select the desired Google APIs. In this case, Gmail API.
     
   • In the search box, you can search for the desired Google APIs. In this case, Gmail API.
     
4. After you select the API, click ENABLE.
   
   You can now access the selected API from your project.