As of December 2024, the Smart home Actions migrated to Google Home Developer Console.
Here are the steps to create a new project in Google Home Developer Console for a Cloud-to-cloud integration:
Go to console.home.google.com/projects in your web browser.
On the "Welcome to the Developer Console" page, click the "Create a project" button.
If you're creating a brand new project, you'll be prompted to enter a project name. After creating the project, you will be taken to the "Project home" dashboard for your newly created project.
Under the "Cloud-to-cloud" section, click on "+ Add cloud-to-cloud integration".
This will initiate the process of setting up your Cloud-to-cloud integration within your new project in the Google Home Developer Console.