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custom.discount_tier), e.g. BF30 or 30.Why does a code give nothing? In “only with campaign codes” mode any other code in the cart (loyalty, gift, bundle) cancels the campaign discount. Gift cards and items priced at 0 are never discounted.
Can two tier codes stack? Yes — BF30 + BF15 together: BF30 discounts BF30 items, BF15 everything else. Shopify allows up to 5 codes per order.
Does the app edit my theme? No. Badges and the optional cart button come from an app embed you switch on or off in the theme editor.