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How To Get Google Indexing API Access Key Or Service Authorization Key?
To access the Indexing API, you need to verify that you are the owner of the website for which you are submitting requests to Google for Updating or Removing URLs from its Search Results.
To verify the ownership you have to obtain a Service Authorization Key/ API Access Key which is a JSON file. This is a one-time process. The complete process is described here.
How To Setup Google Search Console To Use Indexing API?
To use the Indexing API Service, you have to add the Service Account Email ID as Owner in your Search Console Property Setting. The Email ID can be found in the JSON file obtained in the previous step.
Follow these steps to Add Service Account in your Google Search Console Property Setting:
Open Search Console >>> Select Your Website In Property Drop-down
Scroll down and search for Settings in the bottom left corner and click on Settings
In General Settings, click Users and Permissions
Click on the +Add User button in the top right corner
Enter Service Account Email ID and select 'Owner' using the Permission drop-down option
Click ADD and it's done!
How To Use Google Indexing API For WordPress/ Blogger/ Any Website URLs?
Steps to use the Online Indexing API Tool for WordPress/ Blogger/ Any Website: