Programmatically - Magento 2 Get Coupon Code

private OrderRepositoryInterface $orderRepository;

try $quote = $this->quoteRepository->get($quoteId); return $quote->getCouponCode(); catch (NoSuchEntityException $e) return null; magento 2 get coupon code programmatically

public function fromQuote(int $quoteId): ?string private OrderRepositoryInterface $orderRepository

If you need to know which coupon affected a specific cart item (useful for per‑item discount debugging). try $quote = $this-&gt