So for muling, you gotta assign a username to a mule slot. If you're only using 1 mule account then it doesn't matter which slot you choose, as long as you choose the same slot for both the worker and the mule, so both choose Mule A. After assigning the username, the mule will wait/log out until he's called to trade. The worker will bot until the mule condition is reached, e.g. if ran out of crafting items, then it'll send a signal to the mule prompting the mule to login, both will meet up at GE and trade over the items. Right now you can't repeat mule (to let the worker continue botting for the next muling trip etc), however it's a feature in progress. More releases underway
Bankstanding with leathers is pretty low ban rate, bankstanding in general is safe however I recommend using mirror mode to maximise on safety and going in a fuller world to blend in with other players, talk from time to time and avoid botting on multiple accounts same ip/pc. If you do get a ban with 1 account, you can easily appeal the ban and wait a week later anyway ^^
Yep, OSRS gp is accepted, but we must convert osrs gp to osbot store coins, here. I recommend @Fruity