The exchange is very easy at the machine at JR where tickets are sold. But the coverage area is not as stated in Traveloka. It does not reach Kyoto and Osaka. It is only between Kanazawa and Toyama and its surroundings. And it is very limited, for example, only non-reserved trains. So it is not recommended unless you want to go back and forth between Kanazawa and Toyama 5 times.