diff --git a/playstore/notification.go b/playstore/notification.go
index c583507..55e4328 100644
--- a/playstore/notification.go
+++ b/playstore/notification.go
@@ -1,39 +1,63 @@
 package playstore
 
+// https://developer.android.com/google/play/billing/rtdn-reference#sub
+type SubscriptionNotificationType int
+
+const (
+	SubscriptionNotificationTypeRecovered SubscriptionNotificationType = iota + 1
+	SubscriptionNotificationTypeRenewed
+	SubscriptionNotificationTypeCanceled
+	SubscriptionNotificationTypePurchased
+	SubscriptionNotificationTypeAccountHold
+	SubscriptionNotificationTypeGracePeriod
+	SubscriptionNotificationTypeRestarted
+	SubscriptionNotificationTypePriceChangeConfirmed
+	SubscriptionNotificationTypeDeferred
+	SubscriptionNotificationTypePaused
+	SubscriptionNotificationTypePauseScheduleChanged
+	SubscriptionNotificationTypeRevoked
+	SubscriptionNotificationTypeExpired
+)
+
+// https://developer.android.com/google/play/billing/rtdn-reference#one-time
+type OneTimeProductNotificationType int
+
+const (
+	OneTimeProductNotificationTypePurchased OneTimeProductNotificationType = iota + 1
+	OneTimeProductNotificationTypeCanceled
+)
+
 // DeveloperNotification is sent by a Pub/Sub topic.
 // Detailed description is following.
-// https://developer.android.com/google/play/billing/realtime_developer_notifications.html#json_specification
+// https://developer.android.com/google/play/billing/rtdn-reference#json_specification
 type DeveloperNotification struct {
-	Version                  string                   `json:"version"`
-	PackageName              string                   `json:"packageName"`
-	EventTimeMillis          string                   `json:"eventTimeMillis"`
-	SubscriptionNotification SubscriptionNotification `json:"subscriptionNotification,omitempty"`
-	TestNotification         SubscriptionNotification `json:"testNotification,omitempty"`
+	Version                    string                     `json:"version"`
+	PackageName                string                     `json:"packageName"`
+	EventTimeMillis            string                     `json:"eventTimeMillis"`
+	SubscriptionNotification   SubscriptionNotification   `json:"subscriptionNotification,omitempty"`
+	OneTimeProductNotification OneTimeProductNotification `json:"oneTimeProductNotification,omitempty"`
+	TestNotification           TestNotification           `json:"testNotification,omitempty"`
 }
 
-// SubscriptionNotification has subscription status as notificationType, toke and subscription id
+// SubscriptionNotification has subscription status as notificationType, token and subscription id
 // to confirm status by calling Google Android Publisher API.
 type SubscriptionNotification struct {
-	Version          string           `json:"version"`
-	NotificationType NotificationType `json:"notificationType,omitempty"`
-	PurchaseToken    string           `json:"purchaseToken,omitempty"`
-	SubscriptionID   string           `json:"subscriptionId,omitempty"`
+	Version          string                       `json:"version"`
+	NotificationType SubscriptionNotificationType `json:"notificationType,omitempty"`
+	PurchaseToken    string                       `json:"purchaseToken,omitempty"`
+	SubscriptionID   string                       `json:"subscriptionId,omitempty"`
 }
 
-type NotificationType int
+// OneTimeProductNotification has one-time product status as notificationType, token and sku (product id)
+// to confirm status by calling Google Android Publisher API.
+type OneTimeProductNotification struct {
+	Version          string                         `json:"version"`
+	NotificationType OneTimeProductNotificationType `json:"notificationType,omitempty"`
+	PurchaseToken    string                         `json:"purchaseToken,omitempty"`
+	SKU              string                         `json:"sku,omitempty"`
+}
 
-const (
-	NotificationTypeRecovered NotificationType = iota + 1
-	NotificationTypeRenewed
-	NotificationTypeCanceled
-	NotificationTypePurchased
-	NotificationTypeAccountHold
-	NotificationTypeGracePeriod
-	NotificationTypeRestarted
-	NotificationTypePriceChangeConfirmed
-	NotificationTypeDeferred
-	NotificationTypePaused
-	NotificationTypePauseScheduleChanged
-	NotificationTypeRevoked
-	NotificationTypeExpired
-)
+// TestNotification is the test publish that are sent only through the Google Play Developer Console
+type TestNotification struct {
+	Version string `json:"version"`
+}