§12A-2-310.

§12A-2-310.
   
   Unless otherwise agreed
   
   (a) payment is due at the time and place at which the buyer is to
   receive the goods even though the place of shipment is the place of
   delivery; and
   
   (b) if the seller is authorized to send the goods he may ship them
   under reservation, and may tender the documents of title, but the
   buyer may inspect the goods after their arrival before payment is due
   unless such inspection is inconsistent with the terms of the contract
   (Section 2-513); and
   
   (c) if delivery is authorized and made by way of documents of title
   otherwise than by subsection (b) then payment is due at the time and
   place at which the buyer is to receive the documents regardless of
   where the goods are to be received; and
   
   (d) where the seller is required or authorized to ship the goods on
   credit the credit period runs from the time of shipment but
   post-dating the invoice or delaying its dispatch will correspondingly
   delay the starting of the credit period.