diff --git a/appstore/model.go b/appstore/model.go
index 672afb9..58c8eb1 100644
--- a/appstore/model.go
+++ b/appstore/model.go
@@ -119,6 +119,7 @@ type (
 		SubscriptionAutoRenewStatus    string `json:"auto_renew_status"`
 		SubscriptionPriceConsentStatus string `json:"price_consent_status"`
 		ProductID                      string `json:"product_id"`
+		OriginalTransactionID          string `json:"original_transaction_id"`
 	}
 
 	// The IAPResponse type has the response properties