finish refund

cmd/api/handlers-api.go

@@ -570,6 +570,17 @@ func (app *application) RefundCharge(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// update status in DB
+	err = app.DB.UpdateOrderStatus(chargeToRefund.ID, 2)
+	if err != nil {
+		app.badRequest(
+			w,
+			r,
+			errors.New("the charge was refunded, but the database could not be updated"),
+		)
+		return
+	}
+
 	var resp jsonResponse
 	resp.OK = true
 	resp.Message = "Charge refunded"