diff --git a/README.md b/README.md
index 80829bb..ff616e7 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,7 @@ Currently supports **v2** only, if you want to use **v1**, use **v1.1.4** git ta
  * GET /v2/payments/refund/**ID**
  * POST /v2/checkout/orders
  * GET /v2/checkout/orders/**ID**
+ * PATCH /v2/checkout/orders/**ID**
  * POST /v2/checkout/orders/**ID**/authorize
  * POST /v2/checkout/orders/**ID**/capture
  * POST /v2/payments/billing-plans
@@ -115,22 +116,22 @@ order, err := c.GetOrder("O-4J082351X3132253H")
 order, err := c.CreateOrder(paypalsdk.OrderIntentCapture, []paypalsdk.PurchaseUnitRequest{paypalsdk.PurchaseUnitRequest{ReferenceID: "ref-id", Amount: paypalsdk.Amount{Total: "7.00", Currency: "USD"}}})
 ```
 
+### Update Order by ID
+
+```go
+order, err := c.UpdateOrder("O-4J082351X3132253H", []paypalsdk.PurchaseUnitRequest{})
+```
+
 ### Authorize Order
 
 ```go
-auth, err := c.AuthorizeOrder(orderID, paypalsdk.PaymentSource{})
+auth, err := c.AuthorizeOrder(orderID, paypalsdk.AuthorizeOrderRequest{})
 ```
 
 ### Capture Order
 
 ```go
-capture, err := c.CaptureOrder(orderID, paypalsdk.PaymentSource{})
-```
-
-### Void Order
-
-```go
-order, err := c.VoidOrder(orderID)
+capture, err := c.CaptureOrder(orderID, paypalsdk.CaptureOrderRequest{})
 ```
 
 ### Identity
diff --git a/order.go b/order.go
index b6beaab..d0ddfbe 100644
--- a/order.go
+++ b/order.go
@@ -40,12 +40,29 @@ func (c *Client) CreateOrder(intent string, purchaseUnits []PurchaseUnitRequest,
 	return order, nil
 }
 
-// AuthorizeOrder - Use this call to authorize an order.
+// UpdateOrder updates the order by ID
+// Endpoint: PATCH /v2/checkout/orders/ID
+func (c *Client) UpdateOrder(orderID string, purchaseUnits []PurchaseUnitRequest) (*Order, error) {
+	order := &Order{}
+
+	req, err := c.NewRequest("PATCH", fmt.Sprintf("%s%s%s", c.APIBase, "/v2/checkout/orders/", orderID), purchaseUnits)
+	if err != nil {
+		return order, err
+	}
+
+	if err = c.SendWithAuth(req, order); err != nil {
+		return order, err
+	}
+
+	return order, nil
+}
+
+// AuthorizeOrder - https://developer.paypal.com/docs/api/orders/v2/#orders_authorize
 // Endpoint: POST /v2/checkout/orders/ID/authorize
-func (c *Client) AuthorizeOrder(orderID string, paymentSource PaymentSource) (*Authorization, error) {
+func (c *Client) AuthorizeOrder(orderID string, authorizeOrderRequest AuthorizeOrderRequest) (*Authorization, error) {
 	auth := &Authorization{}
 
-	req, err := c.NewRequest("POST", fmt.Sprintf("%s%s", c.APIBase, "/v2/checkout/orders/"+orderID+"/authorize"), paymentSource)
+	req, err := c.NewRequest("POST", fmt.Sprintf("%s%s", c.APIBase, "/v2/checkout/orders/"+orderID+"/authorize"), authorizeOrderRequest)
 	if err != nil {
 		return auth, err
 	}
@@ -57,12 +74,12 @@ func (c *Client) AuthorizeOrder(orderID string, paymentSource PaymentSource) (*A
 	return auth, nil
 }
 
-// CaptureOrder - Use this call to capture a payment on an order.
+// CaptureOrder - https://developer.paypal.com/docs/api/orders/v2/#orders_capture
 // Endpoint: POST /v2/checkout/orders/ID/capture
-func (c *Client) CaptureOrder(orderID string, paymentSource PaymentSource) (*Capture, error) {
+func (c *Client) CaptureOrder(orderID string, captureOrderRequest CaptureOrderRequest) (*Capture, error) {
 	capture := &Capture{}
 
-	req, err := c.NewRequest("POST", fmt.Sprintf("%s%s", c.APIBase, "/v2/checkout/orders/"+orderID+"/capture"), paymentSource)
+	req, err := c.NewRequest("POST", fmt.Sprintf("%s%s", c.APIBase, "/v2/checkout/orders/"+orderID+"/capture"), captureOrderRequest)
 	if err != nil {
 		return capture, err
 	}
diff --git a/types.go b/types.go
index d8e0e7b..008d6dc 100644
--- a/types.go
+++ b/types.go
@@ -126,6 +126,17 @@ type (
 		ProtectionEligibilityType string     `json:"protection_eligibility_type,omitempty"`
 	}
 
+	// AuthorizeOrderRequest - https://developer.paypal.com/docs/api/orders/v2/#orders_authorize
+	AuthorizeOrderRequest struct {
+		PaymentSource  *PaymentSource `json:"payment_source"`
+		VaultOnCapture bool           `json:"vault_on_capture"`
+	}
+
+	// CaptureOrderRequest - https://developer.paypal.com/docs/api/orders/v2/#orders_capture
+	CaptureOrderRequest struct {
+		PaymentSource *PaymentSource `json:"payment_source"`
+	}
+
 	// BatchHeader struct
 	BatchHeader struct {
 		Amount            *AmountPayout      `json:"amount,omitempty"`