This blog will be updated regularly.

Set Up IAM Identity Center and Organizations

https://genezhang.net/blog/aws/set-up-iam-identity-center

Enable IAM Access to the Billing Console

1. Log in as the root user.
2. Go to the Account Settings page, scroll down, and there’s a section titled IAM User Access to Billing Information. Check the Activate IAM Access check box, and then click Update:

Create a Zero spend budget

Create a Zero spend budget from the template:

Update the budget settings to be daily with a budget $0.01:

Create another Zero spend budget. It's monthly by default:

You will get notifications like: