1. If not already selected, select your current project. If you have not created a project yet, refer to the Create a Google Cloud Platform Project instructions.
2. Click on the menu button at the top left of the page, select APIs & Services, and then select credentials.
3. Click CREATE CREDENTIALS and select Service Account.
4. Give the service account a name and account ID. Descriptions are optional.
5. Click CREATE AND CONTINUE.
6. Skip the Grant this service account access to project section.
7. Skip the Grant users access to this service account section. By default, the user that creates the service account will be the only one with access to this service account.
8. Click DONE.
9. If not redirected, select the menu button in the top left of the page, select APIs & Services, and then select Credentials.
10. Under the Service Accounts, click the pencil icon next to the service account that was created above.
11. Scroll to the Keys section and click ADD Key, then select Create New Key.
12. Select JSON in the popup window and click CREATE.
13. Save the JSON file and store in a secure area.