@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    for (int i = 0; i < products_.size(); i++) {
      output.writeMessage(1, products_.get(i));
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Token to retrieve the next page of results, or empty if there are no more
results in the list.
</pre>

<code>string next_page_token = 2;</code>

@return The bytes for nextPageToken.
java-vision/proto-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/ListProductsInProductSetResponse.java