@java.lang.Override
  public com.google.protobuf.ByteString getServiceAccountEmailBytes() {
    java.lang.Object ref = serviceAccountEmail_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      serviceAccountEmail_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
[Service account email](https://cloud.google.com/iam/docs/service-accounts)
to be used for generating OAuth token.
The service account must be within the same project as the queue. The
caller must have iam.serviceAccounts.actAs permission for the service
account.
</pre>

<code>string service_account_email = 1;</code>

@return The bytes for serviceAccountEmail.
java-tasks/proto-google-cloud-tasks-v2beta3/src/main/java/com/google/cloud/tasks/v2beta3/OAuthToken.java