diff --git a/response.go b/response.go
index e3f23e5..f71bd02 100644
--- a/response.go
+++ b/response.go
@@ -378,10 +378,14 @@ type StructuredMessageElement struct {
 
 // StructuredMessageButton is a response containing buttons
 type StructuredMessageButton struct {
-	Type    string `json:"type"`
-	URL     string `json:"url,omitempty"`
-	Title   string `json:"title,omitempty"`
-	Payload string `json:"payload,omitempty"`
+	Type                string `json:"type"`
+	URL                 string `json:"url,omitempty"`
+	Title               string `json:"title,omitempty"`
+	Payload             string `json:"payload,omitempty"`
+	WebviewHeightRatio  string `json:"webview_height_ratio,omitempty"`
+	MessengerExtensions bool   `json:"messenger_extensions,omitempty"`
+	FallbackURL         string `json:"fallback_url,omitempty"`
+	WebviewShareButton  string `json:"webview_share_button,omitempty"`
 }
 
 // SendSenderAction is the information about sender action