I. Enabling Google Images in Odoo:

1. Navigate to General Settings: In Odoo, go to Settings -> General Settings.
2. Enable Google Images: Locate the "Google Images" option.
3. Enable and Save: Check the box to enable "Google Images" and click Save.
4. Access Credentials: After saving, return to the "Google Images" section in General Settings. You will see fields requiring credential updates.

II. Obtaining the Google API Key:

1. Access Google Cloud Platform: Go to Google Cloud Platform API & Services.
2. Navigate to Credentials: In the left-hand navigation menu, select Credentials.
3. Create Credentials: Click the Create Credentials button.
4. Select API Key: Choose API key from the dropdown menu.
5. Copy API Key: A new API key will be generated. Copy this key.
6. Update Odoo: In Odoo, paste the copied API key into the "API Key" field under the "Google Images" settings.

III. Obtaining the Search Engine ID (Custom Search Engine):

1. Search for Custom Search API: In the Google Cloud Console search bar, type "Custom Search API".
2. Select Custom Search API: Select the Custom Search API from the search results.
3. Enable the API: Click the Enable button. This will redirect you to a confirmation screen.
4. Go to Programmable Search Engine: Navigate to Google Programmable Search Engine.
5. Get Started: Click the Get Started button.
6. Add a New Search Engine: Click the Add button.
7. Configure Search Engine (Important):
8. • Search specific sites or pages (Optional): If you want to restrict image searches to specific websites, select this option and enter the website URLs.
   • Enable Image search: Ensure the "Image search" option is enabled.
   • Enable Safe Search: Enable "Safe Search" to filter explicit content (recommended).
9. Create the Search Engine: Click Create.
10. Copy Search Engine ID: Locate and copy the Search Engine ID (it is usually displayed in a highlighted or clearly labeled section).
11. Update Odoo: Paste the copied Search Engine ID into the "Search Engine ID" field under the "Google Images" settings in Odoo.

IV. Finalizing Odoo Configuration:

1. Save Odoo Settings: In Odoo, click Save in the "Google Images" settings.
2. Access Product Fetch Option: The "Fetch Images from Google" option should now be available in the product master (both list and form views). 

V. Important Notes and Limitations:

• Processing Criteria: Only products or variants with a barcode but no image will be processed. If a product has multiple variants, only those that meet these criteria will be processed.
• Initial Image Fetch: Only the first 10 images are fetched immediately. If you select more than 10, the remaining images are fetched as a background job.
• Background Job Processing: The background job processes approximately 100 images per minute.
• Google Quota: If the quota authorized by Google (either with a free or paid plan) is reached, the background job will pause for 24 hours and resume the following day.