An YouTube API Key is required to automate your galleries. Kindly follow the steps below to create your own key.
Step #1: Login to your developer console
Click Google Developers Console and log in with your Gmail account.
Step #2: Create Project
Create a new project by clicking the “Create Project” button available at the top right side of the page.
If you already have a project. Simply select it.
Step #3: Enable API
Select the “Library” menu.
Type “YouTube” in the “Search for APIs & Services” search box, select “YouTube Data API v3” from the results shown.
Click the “Enable” button.
Step #4: Create Credentials
Select the option to restrict your API Key.
Configure API restrictions and click “Save”.
Step #5: Copy the Key
That’s it. Your API Key is ready. Copy your Key.
Step #6: Add the Key
Go to Video Gallery / Settings / Advanced / API Keys from your WordPress Admin Panel. Paste your key in the “YouTube API Key” field. Save the changes.