I'm very happy, thanks again very much Blain0002! I'm going to push the MOTM button now for your great support on this.
Implemented like you said.
Product: Icash. Then set the hook to ibproarcade_play_game and did the rest you said.
Working perfectly here, after playing a game, the amount of icash is substracted from my account. I did not tested yet if one has 0 credits left, but I presume that will work fine too, so again a VERY happy customer.