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backend/internal/modules/pricing/routes.go

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+package pricing
+
+import "github.com/gin-gonic/gin"
+
+// RegisterAdminRoutes nests price-tier management under a product, e.g.
+// PUT /api/admin/products/:id/price-tiers/:tierId, so tiers are always
+// managed in the context of the product they belong to.
+func RegisterAdminRoutes(rg *gin.RouterGroup, h *Handler, requireAdmin gin.HandlerFunc) {
+	group := rg.Group("/admin/products/:id/price-tiers", requireAdmin)
+	group.GET("", h.ListByProduct)
+	group.POST("", h.Create)
+	group.PUT("/:tierId", h.Update)
+	group.DELETE("/:tierId", h.Delete)
+}
+
+// RegisterPublicRoutes exposes read-only tiers so the storefront can render
+// the available quantity/price options for a product. Kept as its own
+// top-level path (rather than nested under /products/:slug) because the
+// products module's public detail route uses a :slug wildcard at that same
+// position -- gin does not allow two different wildcard names at the same
+// path segment.
+func RegisterPublicRoutes(rg *gin.RouterGroup, h *Handler) {
+	rg.GET("/price-tiers/by-product/:id", h.ListByProduct)
+}