TikTokers are hacking Starbucks' app to get cheap drinks

• TikTokers are hacking Starbucks' mobile app to get drinks at a deep discount.
• Many of the hacks start with buying iced espresso, then customizing it. 
• "It feels illegal that I just bought this coffee for $3," one TikToker said.

Savvy TikTokers looking to save more than pennies on their favorite Starbucks drink are showing coffee lovers how to hack the chain's app to save money on premium drinks such as a pumpkin spiced latte.

One TikToker said she knocked off about 50% on a venti iced coffee with her mobile app hack.