The first three forms of this command check your own cash level and then spend it, either generally or to a particular player. Puppets spend their owner's cash.
The second set of commands and the checkcash function are useful only for those whose puppets/bartenders/etc have CASHIER privileges - send a +request to staff.
$transact extracts $money from a player, and $collect collects the $cash from your cashiers. checkcash() returns 1 if <player> has <amount> of $money either in hand or in the bank.
Your income is set automatically from your resources level. If you wish this changed, justify the change to your sphere wizard.