Promo-heavy stores run an automatic sale, email win-back codes, VIP codes and a staff code at once, and Shopify shows each discount's combination settings one at a time. Stacklens maps every pair: which ones stack, which clash so only one applies, and which are silently excluded because only one side allows the combination. It flags codes that cannot combine with the running sale, never-discount products a discount still reaches, and codes with no end date or limit.
Simple, Intuitive & Powerful, Web to Print app.
Show your customers their savings with a message like Amazon...
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