Creating a Google account
To use Cloud APIs in your applications, you first need to have a Google account. This allows you to use Google developer products, including Google Cloud Console, Cloud SDK, Cloud Logging, and Cloud Monitoring. If you don't have a Google account, you can sign up here.
Creating a Google project
To use Cloud APIs, you also need to have a Google project. A project is equivalent to a developer account. It serves as a resource container for your Google Cloud resources. It also provides an isolation boundary for your usage of Google Cloud services, so you can manage quota limits and billing independently at project level. Usage telemetry and dashboards are grouped by project as well. If you don't already have a project, you can create one using the Cloud Console.
A project can own a wide range of resources, including API keys, OAuth clients, service accounts, Compute Engine VMs, Cloud Storage buckets, and BigQuery datasets. When an application calls a Cloud API, the project that owns the application credentials is called the client project, and the project that owns the target resource is called the resource project. One API request may touch multiple resources, hence multiple resource projects are involved.
If you want to stop using Google Cloud for any reasons, you can use Cloud Console to delete your project. Your project and all resources in the project will be deleted after the retention window. Note that different types of data have different retention periods.
To use a Cloud API, you must enable it for your project. Depending on how many projects are involved, including the client project and resource projects, you may need to enable an API for multiple projects.
Enabling an API requires you to accept the Terms of Service and billing
responsibility for the API. You need permission
on the project and permission
servicemanagement.services.bind on the API to
enable it. For more information, see Service Usage
To enable an API for a project using the console:
- Go to the Cloud Console API Library.
- From the projects list, select a project or create a new one.
- In the API Library, select the API you want to enable. If you need help finding the API, use the search field and/or the filters.
- On the API page, click ENABLE.
From the same page you can disable an API for your project if you no longer use it to avoid misuse and accidental billing charges. You can also enable and disable Cloud APIs using Cloud SDK and Service Usage API.
Some Cloud APIs charge for usage. You need to enable billing for your project before you can start using these APIs in your project. The API usage in a project is charged to the billing account associated with the project.
Getting and using application credentials
Cloud APIs only accept API requests from registered applications. This requirement helps API producers associate and report API usage to the right project owning the application.
Cloud APIs use application credentials for identifying the calling applications. Credential types include API keys, OAuth 2.0 clients, and service accounts. For more information about authentication and application credentials, see Authentication Overview.
If you are new to Cloud APIs, we highly recommend that you use
oauth2l to experiment your application
credentials and Cloud APIs before writing your application code.
If you are building an application using Cloud APIs, we recommend you to use Google Cloud Client Libraries if available. The client libraries handle common API features for your convenience, such as authentication, error handling, retry, and payload validation. For more information, see Client Libraries Explained.
For more information about billing, see Create, modify, or close your billing account.
For more information about enabling billing on your project, see Modify a project's billing settings.
For more information about enabling and disabling APIs, see Enabling and disabling services.