What payment terms are N13 23p 3rd 13sub?

The payment terms "N13 23p 3rd 13sub" typically refer to a specific agreement for payment conditions. "N13" usually indicates the net amount due in 13 days, while "23p" suggests a 2% discount if paid within 3 days. "3rd" may imply that the payment is due on the 3rd of the month, and "13sub" could refer to a sub-account or specific terms applicable to a particular contract or customer. Always check the specific context for accurate interpretation.