I am in the process of hacking a vending machine. The machine has a display which runs android and an application is pinned to the screen which users can interact with to buy products.

I found a way to open other applications via this pinned application by a clever trick.

I have access to almost everything other than the hardware.

i got the apk file and also found some hardcoded information which can be critical. I can access settings, i can call someone, i can download or load any application/code on the machine and lots more.

But i havent really coded for this and i havent really reverse engineered anything here and it feels incomplete without that.

I want to actually hack the machine to a point that i can dispense products for free, how can i actually do that? i’m not expecting any step by step tutorial that would work for me, but any resources that might help me with knowledge are very appreciated.

i have also informed the company as well, they are taking about the compensation with their finance team and have also offered me a job after college.

anyways, i want to hack it really and do it responsibly, please share your knowledge experts