more testing

cmd/cart/checkout_builder.go

@@ -69,7 +69,7 @@ func BuildCheckoutOrderPayload(grain *cart.CartGrain, meta *CheckoutMeta) ([]byt
 			Name:           it.Meta.Name,
 			Quantity:       it.Quantity,
 			UnitPrice:      int(it.Price.IncVat),
-			TaxRate:        2500, // TODO: derive if variable tax rates are introduced
+			TaxRate:        it.Tax, // TODO: derive if variable tax rates are introduced
 			QuantityUnit:   "st",
 			TotalAmount:    int(it.TotalPrice.IncVat),
 			TotalTaxAmount: int(it.TotalPrice.TotalVat()),

pkg/cart/cart-grain.go

@@ -37,6 +37,7 @@ type CartItem struct {
 	Price       Price   `json:"price"`
 	TotalPrice  Price   `json:"totalPrice"`
 	OrgPrice    *Price  `json:"orgPrice,omitempty"`
+	Tax         int
 	Stock       StockStatus `json:"stock"`
 	Quantity    int         `json:"qty"`
 	Discount    *Price      `json:"discount,omitempty"`

pkg/cart/mutation_add_item.go

@@ -63,6 +63,7 @@ func AddItem(g *CartGrain, m *messages.AddItem) error {
 		ItemId:   uint32(m.ItemId),
 		Quantity: int(m.Quantity),
 		Sku:      m.Sku,
+		Tax:      int(taxRate * 100),
 		Meta: &ItemMeta{
 			Name:       m.Name,
 			Image:      m.Image,