To get Client ID & Client Secret you will need to create a new Project with your google account.
-Go to Google Console & login with your gmail account.
-Click on New Project & add a new name for your project. Click Create button after that.
– Now on your project dashboard click on Enable APIS & SERVICES.
– Enable the DRIVE & SHEET api for your project.
-Now click on Credentials on left sidebar & then Click on OAuth Consent Screen.
-Add Application Name, anything you like.
– Now click on Credentials & select OAuth Client ID.
– Next Select Application type as Other and add any Name you like
Click Create button at bottom.
-Next Copy the Client ID & Client Secret and paste it on Woocommerce Addon Settings