How do payment terms from Pallet Connect transfer to Quickbooks? 

When an invoice is imported from Pallet Connect into Quickbooks the due date is determined by the Invoice created in Pallet Connect.

If payment terms are set up for a customer in Quickbooks, this will still be saved in the system but the invoice due date uses the terms in Pallet Connect. 

If the Customer does not have a profile in Quickbooks then a new profile will be created on export of the invoice, using information from Pallet Connect; including payment terms.  

Having Pallet Connect set the due date is by design. Just like adding an invoice in Quickbooks directly, the due date can override the date set by the payment terms.

This is also important because if an invoice is sent from Pallet Connect, it should match information the customer received.

It is recommended practise to enter payment terms for customers, in the "Invoice details" tab of the contact profile.  Also to make sure they match the term types that have been set up in Quick Books.

NOTE: This also applies to any purchase terms. 

See related articles on setting up payment/purchase terms.