diff --git a/README.md b/README.md
index e559656..20abfd9 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,9 @@ func main() {
 		Currency: CurrencyJPY,
 		Amount:   350,
 		Items: []Item{
-			{Name: "レブロン 18 LOW", Amount: 250, Currency: CurrencyJPY, Quantity: 1},
+			{Name: "レブロン 18 LOW", Amount: 1000, Currency: CurrencyJPY, Quantity: Ptr(1)},
+			{Name: "discount", Amount: 100, Currency: CurrencyJPY, Kind: Ptr(LineItemKindDiscount)},
+			{Name: "tax", Amount: 250, Currency: CurrencyJPY, Kind: Ptr(LineItemKindTax)},
 		},
 		ShippingInfo: ShippingInfo{
 			Address:     Address{Country: AddressCountryJP, PostalCode: "123", Locality: "locality", Line1: "line1"},
diff --git a/const.go b/const.go
index 6313ca2..23cd3f6 100644
--- a/const.go
+++ b/const.go
@@ -158,3 +158,10 @@ const (
 
 	ExpandNo Expand = "no"
 )
+
+// Defines values for LineItemKind
+const (
+	LineItemKindProduct  LineItemKind = "product"
+	LineItemKindDiscount LineItemKind = "discount"
+	LineItemKindTax      LineItemKind = "tax"
+)
diff --git a/tests/integration/order_test.go b/tests/integration/order_test.go
index 38d02f5..e6dcba9 100644
--- a/tests/integration/order_test.go
+++ b/tests/integration/order_test.go
@@ -80,6 +80,19 @@ func (suite *IntegrationTestSuite) TestRetrieveAnOrderExpanded() {
 
 	order, _ := ConvertToStruct[OrderExpanded](result.JSON200)
 	suite.NotNil(order.Id)
+
+	suite.Run("TestRetrieveAnOrderExpandedSupportsNewLineItem", func() {
+		for _, item := range *order.LineItems {
+			if *item.Kind == LineItemKindTax {
+				suite.EqualValues(int(*item.Amount), 250)
+				suite.EqualValues(*item.Currency, CurrencyJPY)
+			}
+			if *item.Kind == LineItemKindDiscount {
+				suite.EqualValues(int(*item.Amount), 100)
+				suite.EqualValues(*item.Currency, CurrencyJPY)
+			}
+		}
+	})
 }
 
 func (suite *IntegrationTestSuite) TestCancelAnOrder() {
diff --git a/tests/integration/suite_test.go b/tests/integration/suite_test.go
index 540ea77..3245809 100644
--- a/tests/integration/suite_test.go
+++ b/tests/integration/suite_test.go
@@ -29,9 +29,11 @@ func TestCheckOutTestSuite(t *testing.T) {
 func NewCheckoutPayload() *CreateACheckoutSessionJSONRequestBody {
 	checkoutPayload := CreateACheckoutSessionJSONRequestBody{
 		Currency: CurrencyJPY,
-		Amount:   350,
+		Amount:   1250,
 		Items: []Item{
-			{Name: "レブロン 18 LOW", Amount: 250, Currency: CurrencyJPY, Quantity: 1},
+			{Name: "レブロン 18 LOW", Amount: 1000, Currency: CurrencyJPY, Quantity: Ptr(1)},
+			{Name: "discount", Amount: 100, Currency: CurrencyJPY, Kind: Ptr(LineItemKindDiscount)},
+			{Name: "tax", Amount: 250, Currency: CurrencyJPY, Kind: Ptr(LineItemKindTax)},
 		},
 		ShippingInfo: ShippingInfo{
 			Address:     Address{Country: AddressCountryJP, PostalCode: "123", Locality: "locality", Line1: "line1"},
diff --git a/types.go b/types.go
index b5a6009..6114f1c 100644
--- a/types.go
+++ b/types.go
@@ -266,11 +266,17 @@ type EventSubscription string
 // A URL for an image for this product, meant to be displayed to the customer.
 type ImageUrl string
 
+// LineItem Kind
+type LineItemKind string
+
 // Item
 type Item struct {
 	// The unit amount of this line item.
 	Amount float32 `json:"amount"`
 
+	// The kind of this line item. Can be either of product, tax and discount. If non given it will be treated as a product
+	Kind *LineItemKind `json:"kind,omitempty"`
+
 	// The brand of the Product.
 	Brand *string `json:"brand,omitempty"`
 
@@ -306,7 +312,7 @@ type Item struct {
 	ProductMetadata *Metadata `json:"productMetadata,omitempty"`
 
 	// The quantity of products. Needs to be positive or zero.
-	Quantity int `json:"quantity"`
+	Quantity *int `json:"quantity,omitempty"`
 
 	// A - ideally unique - string to reference the Product in your system (e.g. a product ID, etc.).
 	Reference *string `json:"reference,omitempty"`
@@ -321,6 +327,15 @@ type LineItemExpanded struct {
 	CreatedAt   *CreatedAt `json:"createdAt,omitempty"`
 	Description *string    `json:"description,omitempty"`
 
+	// The kind of this line item. Can be either of product, tax and discount. If non given it will be treated as a product
+	Kind *LineItemKind `json:"kind,omitempty"`
+
+	// The unit amount of this line item.
+	Amount *float32 `json:"amount,omitempty"`
+
+	// Three-letter ISO currency code, in uppercase. Must be a supported currency.
+	Currency *Currency `json:"currency,omitempty"`
+
 	// The unique identifier for the Line Item object.
 	Id *LineItemId `json:"id,omitempty"`