In the exporting industry, we tend to talk about our roles in general terms: I’m the exporter, you’re the importer, he’s the freight forwarder, etc. However, these terms aren’t always precise enough.
In some circumstances, it's more accurate to say "I am the U.S. Principal Party in Interest (USPPI)" instead of "I am the exporter." It's important to understand the difference in meaning between these two terms.