Your cat hears a thunk after each time your cat slides a coin into the machine...
Nothing happens. What a scam! The vending machine must be broken.
Nothing else happens.
Luck-weighted
Your cat pushes coins into the slot...
Moments later your cat hears a loud banging sound then some items pop out!
Get a random item from chapter common
Get a random item from consumables
Luck-weighted
Your cat pays 10 coins and a bunch of items tumble down out of the vending machine!
Get a random item from chapter common
Get a random item from consumables
Get a random item from chapter common
Get a random item from consumables
Shake machine
STR check
Pass STR roll · common tier
Your cat shakes the vending machine and several of the items inside drop out!
Get a random item from chapter common
Get a random item from consumables
Pass STR roll · rare tier
Your cat deftly tips the vending machine and shakes it causing items to drop out!
Get a random item from chapter common
Get a random item from consumables
Get a random item from tech items
Get a random item from tech items
Fail STR roll · common tier
Your cat shakes the vending machine valiantly but the items inside are held fast.
Nothing else happens.
Fail STR roll · rare tier
Your cat pushes and pulls at the machine, trying to dislodge some of the contents...
Your cat slips and the whole machine tips over on top of your cat!
Your cat ignores the vending machine and moves on.
Nothing else happens.
Exact where the game's data defines the odds (no-roll choices, fixed chances, weighted pools). Stat checks, the common/rare split and luck-weighted picks depend on rolls the data doesn't spell out, so they're labelled instead of guessed.