more cart

cmd/checkout/checkout_builder.go

@@ -151,6 +151,33 @@ func BuildCheckoutOrderPayload(grain *checkout.CheckoutGrain, meta *CheckoutMeta
 		})
 	}
 
+	// Reflected applied promotions as negative discount lines
+	if grain.CartState != nil {
+		for _, ap := range grain.CartState.AppliedPromotions {
+			if ap.Pending {
+				continue
+			}
+			discountVal := int64(0)
+			if ap.Discount != nil {
+				discountVal = ap.Discount.IncVat.Int64()
+			}
+			if discountVal <= 0 {
+				continue
+			}
+			lines = append(lines, &Line{
+				Type:           "discount",
+				Reference:      "promo-" + ap.PromotionId,
+				Name:           "Promotion: " + ap.Name,
+				Quantity:       1,
+				UnitPrice:      int(-discountVal),
+				QuantityUnit:   "st",
+				TotalAmount:    int(-discountVal),
+				TaxRate:        2500,
+				TotalTaxAmount: int(-discountVal * 2500 / 12500),
+			})
+		}
+	}
+
 	order := &CheckoutOrder{
 		PurchaseCountry:    country,
 		PurchaseCurrency:   currency,
@@ -285,6 +312,30 @@ func BuildAdyenCheckoutSession(grain *checkout.CheckoutGrain, meta *CheckoutMeta
 		})
 	}
 
+	// Reflected applied promotions as negative discount lines
+	if grain.CartState != nil {
+		for _, ap := range grain.CartState.AppliedPromotions {
+			if ap.Pending {
+				continue
+			}
+			discountVal := int64(0)
+			if ap.Discount != nil {
+				discountVal = ap.Discount.IncVat.Int64()
+			}
+			if discountVal <= 0 {
+				continue
+			}
+			lineItems = append(lineItems, adyenCheckout.LineItem{
+				Quantity:           common.PtrInt64(1),
+				AmountIncludingTax: common.PtrInt64(-discountVal),
+				Description:        common.PtrString("Promotion: " + ap.Name),
+				AmountExcludingTax: common.PtrInt64(-discountVal * 10000 / 12500),
+				TaxAmount:          common.PtrInt64(-discountVal * 2500 / 12500),
+				TaxPercentage:      common.PtrInt64(2500),
+			})
+		}
+	}
+
 	return &adyenCheckout.CreateCheckoutSessionRequest{
 		Reference: grain.Id.String(),
 		Amount: adyenCheckout.Amount{