NetSuite-ShipStation Custom Field Mapping

I already have a working NetSuite ↔ ShipStation connector that pushes standard order data without issue. The remaining gap is five customer-level notes that I keep in NetSuite—“Custom 1, 2, 3”, “Internal Note”, and “Note From Buyer.” I need these text fields to travel with every order and land in equivalent custom fields inside ShipStation.

The job is straightforward: extend the existing SuiteScript / RESTlet logic (or whatever method you prefer) so those three NetSuite fields are picked up, passed through the ShipStation API, and show up on the order record there. No extra validation or special formatting is required; plain text is fine as long as the content matches exactly.

Please update the code, deploy it to my sandbox first, run a sample order end-to-end, and document the changes so I can reproduce them in production. If questions come up about field IDs or API keys, I’ll provide them right away.