In order for Jaden to be able to acquire the security points, he would need to complete several missions.
Missions were randomly provided by the system, ever since the day that the currency that was being used in Nazu Nation had been canceled. With the establishment of several strongholds, that was something that was to be expected.
And the reason why he was receiving security points, instead of rewards from the system, it was simply because of the opening of the store. With the store, as long as he had enough currency, he could purchase whatever he wanted.
So, different missions with different requirements provided Jaden with quite a number of security points. And it was those security points that he was supposed to use in order to be able to purchase anything from the store.
Well, Jaden felt that there was not that much difference, considering that he would be able to purchase whatever he wanted from the store as long as he had the security points.
