How do I implement countdown timers in carts?

As a Shopify store owner in the competitive fashion accessories market, I've been struggling to convert cart visitors into actual customers. My analytics show a frustrating pattern: people add items to their cart, but then mysteriously disappear before completing the purchase. I've tried generic pop-ups and discount codes, but nothing seems to create that critical sense of urgency that nudges shoppers to finalize their transaction. I need a solution that feels authentic, doesn't look spammy, and genuinely motivates customers to complete their purchase. I'm looking for a way to implement countdown timers that are not just decorative, but strategically designed to reduce cart abandonment. The timer needs to feel native to my store's design, be precise to the second, and most importantly, be smart enough to target only those visitors who are actually on the fence about purchasing. I don't want to annoy my dedicated buyers or create a sense of false urgency. What I need is a sophisticated, data-driven approach to implementing countdown timers that actually increases my conversion rates without compromising the user experience or my brand's integrity.