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Google Identity Services provides with a customized Sign In/Sign Up Button. We will discuss how to use Google Sign In or One Tap in front-end applications that use Ruby on Ruby on Rails as the server. We need to create an application in the Google Developer Console to use the OAuth Client ID. We also need to set our One Tap Sign In button to show that Google has been defined globally in our application. We can also use the One Tap Button to display a customized sign-in button.