def METHOD_NAME(project_id: Optional[str] = None,
                                opts: Optional[pulumi.InvokeOptions] = None) -> AwaitableGetProjectServiceAccountResult:
    """
    Get the email address of a project's Access Approval service account.
    Each Google Cloud project has a unique service account used by Access Approval.
    When using Access Approval with a
    [custom signing key](https://cloud.google.com/cloud-provider-access-management/access-approval/docs/review-approve-access-requests-custom-keys),
    this account needs to be granted the `cloudkms.signerVerifier` IAM role on the
    Cloud KMS key used to sign approvals.
    ## Example Usage
    ```python
    import pulumi
    import pulumi_gcp as gcp
    service_account = gcp.accessapproval.get_project_service_account(project_id="my-project")
    iam = gcp.kms.CryptoKeyIAMMember("iam",
        crypto_key_id=google_kms_crypto_key["crypto_key"]["id"],
        role="roles/cloudkms.signerVerifier",
        member=f"serviceAccount:{service_account.account_email}")
    ```
    :param str project_id: The project ID the service account was created for.
    """
    __args__ = dict()
    __args__['projectId'] = project_id
    opts = pulumi.InvokeOptions.merge(_utilities.get_invoke_opts_defaults(), opts)
    __ret__ = pulumi.runtime.invoke('gcp:accessapproval/getProjectServiceAccount:getProjectServiceAccount', __args__, opts=opts, typ=GetProjectServiceAccountResult).value
    return AwaitableGetProjectServiceAccountResult(
        account_email=pulumi.get(__ret__, 'account_email'),
        id=pulumi.get(__ret__, 'id'),
        name=pulumi.get(__ret__, 'name'),
        project_id=pulumi.get(__ret__, 'project_id'))