Follow the instructions below to obtain your Google Sheets API Key.
(01) Go to the Google Cloud Console. If you haven’t used Cloud Console before then Google may ask you to identify your country and agree to its terms of service. Then click on Agree and Continue.
(02) If you already used the Cloud console before then click on Select a project from the menu bar and then click on New Project.
(03) In the Project Name field, enter the name of the new project, for example GS2TABLE and click on Create.
(04) Now click on a menu icon (three dashes in the upper left corner) and click on APIs &; Services and Dashboard.
(05) Now check that your project is selected and click on Enable APIs and Services.
Then select:
(06) A page with all API services will be opened. Search for Google Sheets API there and click on it.
Then select:
(07) Click on the Enable button.
(08) Now select Credentials from the left side menu.
(09) Now click on Credentials in APIs and Services.
(10) Now click on CREATE CREDENTIALS and select API Key.
(11) Now in few seconds your API Key will be displayed on your screen.
(12) Copy the API Key and paste it in the appropriate section in your App Manager.
(13) If not already, get your Google Sheets ID and Name, and set the Permissions for your Spreadsheet. If you did this already, you’re done.