Create discount codes and promotions

I need a limited-time discount for the weekend promotion and the code must be easy to use. Create a discount code WEEKEND20 that gives 20 percent off sitewide for two days starting Friday at 00:00 and expiring Sunday at 23:59, limits to one use per customer, excludes gift cards, and sets a usage cap of 2,000 redemptions. Notify marketing when it’s active.

Before we publish the promo, make it approval-friendly for the promotions reviewer. Show projected margin impact at the top, list excluded SKUs and channels clearly, display the redemption cap and per-customer limit, and flag any conflicts with existing bundles or ongoing loyalty offers that would stop checkout or frustrate customers.

Marketing signed off on WEEKEND20, yet a few customers report it rejects at checkout. I’m afraid the code conflicts with existing bundle rules or channel exclusions and I can’t see which rule blocks those customers. What’s the fastest way to reproduce the failure and identify which exclusion or promotion priority to change so the code works for everyone it should?

Every quarter we push discounts that somehow block expected customers or double-apply, forcing last-minute fixes and lost sales. We waste marketing credibility and developer time. Is the recurring root cause usually messy rule layering, lack of a promotional calendar, or unclear ownership of exclusion rules? What single governance habit should we introduce so promotions work as intended without firefights?