Re: How do I allow specific USPS International shipping options for certain items?
Yes, that's it. The instructions should outline what you need to do in order to implement the volume filtering. All the flat rate box volumes are embedded within the code. If you're using your own boxing, there may be issues. Marco has been good about answering questions in the support thread.
We have our product volumes tweaked so that the smaller package size selections are removed from the list when the total volume is exceeded.
Rick
RixStix (dot) com
aka: ChainWeavers (dot) com