gcloud alpha billing accounts projects link

NAME: gcloud alpha billing accounts projects link - link a project with a billing account
SYNOPSIS: gcloud alpha billing accounts projects link PROJECT_ID (--account-id=ACCOUNT_ID | --billing-account=ACCOUNT_ID) [GCLOUD_WIDE_FLAG …]
DESCRIPTION: (ALPHA) (DEPRECATED) The gcloud alpha billing accounts projects group has been moved to gcloud billing projects. Please use the new, shorter commands instead.
This command links a billing account to a project.
If the specified billing account is open, this enables billing on the project.
EXAMPLES: To link a billing account 0X0X0X-0X0X0X-0X0X0X with a project my-project, run:
gcloud alpha billing accounts projects link my-project --billing-account=0X0X0X-0X0X0X-0X0X0X
POSITIONAL ARGUMENTS: PROJECT_ID

Specify a project id.
REQUIRED FLAGS: Exactly one of these must be specified:

--account-id=ACCOUNT_ID

(DEPRECATED) Specify a billing account ID. Billing account IDs are of the form 0X0X0X-0X0X0X-0X0X0X. To see available IDs, run $ gcloud billing accounts list.
The --account-id flag has been renamed --billing-account.

--billing-account=ACCOUNT_ID

Specify a billing account ID. Billing account IDs are of the form 0X0X0X-0X0X0X-0X0X0X. To see available IDs, run $ gcloud billing accounts list.
GCLOUD WIDE FLAGS: These flags are available to all commands: --access-token-file, --account, --billing-project, --configuration, --flags-file, --flatten, --format, --help, --impersonate-service-account, --log-http, --project, --quiet, --trace-token, --user-output-enabled, --verbosity.
Run $ gcloud help for details.
NOTES: This command is currently in alpha and might change without notice. If this command fails with API permission errors despite specifying the correct project, you might be trying to access an API with an invitation-only early access allowlist.