public com.google.protobuf.ByteString getClientIdBytes() {
          java.lang.Object ref = clientId_;
          if (ref instanceof String) {
            com.google.protobuf.ByteString b =
                com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
            clientId_ = b;
            return b;
          } else {
            return (com.google.protobuf.ByteString) ref;
          }
        }
<pre>
Required. The client (application) ID of the application with federated
credentials.
</pre>

<code>string client_id = 1 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for clientId.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java