Try to get a Google Vertex API key working locally. It's even more complicated. Took me literally one full day to get the whole toolchain working (had to do some pauses out of frustration).

I only went through it because I got once 300 USD for free to spend on my Google Workspace account I/my business owns.

OpenAI API usage is so much easier.

Btw Google: Fix Google Console API usage dashboard... why is there a delay of 2+ days? Why cannot I see (and block!) the usage of the current day?