As a follow-up on our recent communication on December 14 about API Checkout changes, we'd like to share some additional documentation to support your implementation.
We will require Google reCAPTCHA v2 Checkbox in addition to v3.
Google reCAPTCHA v2 Checkbox is another strong way to further weed out bot activity from real guest and member purchases. Unlike v3, you can manage v2 through your own Google account.
We have updated our Checkout APIs - Best Practices and Security article with additional details.