YotuWP uses the YouTube API v3.0 to retrieve video image, title and description of videos.
To generate API code:
Go to Google Developers Console and log in with your Google account.
Create the new project (name does not matter for the plugin). Click on My Project to create new one.
Go to your project (by clicking on its name in the list).
In the sidebar on the left, click Library.
In the list of APIs search for “youtube” or go to YouTube Data API (v3) and make sure that it’s enabled (Enable).
In the same sidebar click Credentials. Then click on CreateCredentials and choose Browser key.
Click Restrict Key button on the popup to setup some other settings to restrict your API Key.
Then press Save to set all option to default for using API Key or follow advance setting below
Optional: You can setup the Application restrictions to allow API key for using on your site or hosting only
Optional: You can setup the API restrictions to use with Youtube Data API 3 only