<prompt> Translate the following text to EnglishKwa mfano, vitengo vinavyoshughulikia malipo chini ya uongozi wa maafisa wa vyeti na wa kutoa malipo vinapaswa kuwa na shughuli za kudhibiti ndani ili kuhakikisha malipo ni halali, sahihi, halali na sahihi na kwamba malipo ya mara mbili yanapuuzwa.  <response>: In particular, the units that process payments under the direction of the certifying and disbursing officers should have in place effective internal control activities6 to ensure payments are legal, proper, valid, and accurate and that duplicate payments are avoided. 