public com.google.protobuf.ByteString getPageTokenBytes() {
      java.lang.Object ref = pageToken_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        pageToken_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
A token identifying a page of results for the server to return.
Typically obtained via
[ListCorporaResponse.next_page_token][google.cloud.visionai.v1.ListCorporaResponse.next_page_token]
of the previous
[Warehouse.ListCorpora][google.cloud.visionai.v1.Warehouse.ListCorpora]
call.
</pre>

<code>string page_token = 3;</code>

@return The bytes for pageToken.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ListCorporaRequest.java