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+To prevent different systems adopting the same vendor codes for the account number and preferences fields, this page is a list of all known and claimed vendor codes.
+
+Code | Owner | Notes
+-----|-------|------
+HLNX | [Helena Express LLC](https://helena.express) |
+PP   | [PostalPoint](https://postalpoint.us) |
+PPK  | [PostalPoint](https://postalpoint.us) | Used for self-serve kiosk preferences.
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