When using the USB peripheral on STM32 MCU's, you can choose between the vendor-provided USB stack and a third-party one like TinyUSB. The vendor-provided is inconvenient to use because even though it provides a selection of predefined classes, the code generation always overwrites any changes one might need to make to the stack to customize it or even to fix bugs in the implementation. TinyUSB has the advantage to be hardware-independent, is easy-to-use and highly customizable. Its disadvantage is that its integration into STM32CubeIDE and the HAL is not straight-forward. Hence this guide.