https://medium.com/canopas/golang-handling-appstore-server-to-server-v2-notifications-ef1e8eb05118 - app-store-notification-structure

app_store-notification-structures.go

        // Notification signed payload
	type NotificationPayload struct {
		jwt.StandardClaims
		NotificationType    string           `json:"notificationType"`
		Subtype             string           `json:"subtype"`
		NotificationUUID    string           `json:"notificationUUID"`
		NotificationVersion string           `json:"notificationVersion"`
		Data                NotificationData `json:"data"`
	}

	// Notification Data
	type NotificationData struct {
		jwt.StandardClaims
		AppAppleID            int    `json:"appAppleId"`
		BundleID              string `json:"bundleId"`
		BundleVersion         string `json:"bundleVersion"`
		Environment           string `json:"environment"`
		SignedRenewalInfo     string `json:"signedRenewalInfo"`
		SignedTransactionInfo string `json:"signedTransactionInfo"`
	}

	// Notification Transaction Info
	type TransactionInfo struct {
		jwt.StandardClaims
		TransactionId               string `json:"transactionId"`
		OriginalTransactionID       string `json:"originalTransactionId"`
		WebOrderLineItemID          string `json:"webOrderLineItemId"`
		BundleID                    string `json:"bundleId"`
		ProductID                   string `json:"productId"`
		SubscriptionGroupIdentifier string `json:"subscriptionGroupIdentifier"`
		PurchaseDate                int    `json:"purchaseDate"`
		OriginalPurchaseDate        int    `json:"originalPurchaseDate"`
		ExpiresDate                 int    `json:"expiresDate"`
		Type                        string `json:"type"`
		InAppOwnershipType          string `json:"inAppOwnershipType"`
		SignedDate                  int    `json:"signedDate"`
		Environment                 string `json:"environment"`
	}

	// Notification Renewal Info
	type RenewalInfo struct {
		jwt.StandardClaims
		OriginalTransactionID  string `json:"originalTransactionId"`
		ExpirationIntent       int    `json:"expirationIntent"`
		AutoRenewProductId     string `json:"autoRenewProductId"`
		ProductID              string `json:"productId"`
		AutoRenewStatus        int    `json:"autoRenewStatus"`
		IsInBillingRetryPeriod bool   `json:"isInBillingRetryPeriod"`
		SignedDate             int    `json:"signedDate"`
		Environment            string `json:"environment"`
	}