Create credentials in the Google Developers Console

To access Google Sheets programmatically using API, you'll need to create credentials in the Google Developers Console. Here's a step-by-step guide on how to find the Google client ID and secret:

Go to the Google Developers Console: Visit the Google Developers Console at https://console.developers.google.com/.
Create a New Project: If you haven't created a project before, click on the "Select a project" dropdown at the top of the page and then click on the "+ New Project" button to create a new project. Otherwise, select your existing project.
Enable the Google Sheets API: In the Google Developers Console, navigate to the "Library" section from the left sidebar menu. Search for "Google Sheets API" and click on it. Then, click the "Enable" button to enable the API for your project.
Create Credentials: After enabling the Google Sheets API, navigate to the "Credentials" section from the left sidebar menu.
Create OAuth Client ID: Click on the "Create credentials" button and select "OAuth client ID" from the dropdown menu.
Configure the OAuth Consent Screen: If you haven't configured the OAuth consent screen before, you'll be prompted to set it up. Follow the instructions to configure the consent screen with the required information such as application name, user support email, and scopes.
Choose Application Type: Select "Web application" as the application type.
Add Authorized Redirect URIs: Add the authorized redirect URIs where Google will redirect the user after they grant access. For accessing Google Sheets API, you can use something like https://developers.google.com/oauthplayground for testing purposes.
Create OAuth Client ID: Click on the "Create" button to create your OAuth client ID. Google will generate a client ID and client secret for your application.
Access Credentials: Once the OAuth client ID is created, you can view and manage your credentials under the "OAuth 2.0 Client IDs" section in the "Credentials" tab.
Copy Client ID and Secret: Copy the generated client ID and client secret. These are the credentials you'll use to authenticate your application when accessing Google Sheets API programmatically.

Remember to keep your client secret secure and never share it publicly or expose it in client-side code. It should be treated as sensitive information. Additionally, ensure that you properly handle authentication and authorization in your application following Google's best practices.