Looking for free VW Group vehicle databases, VIN data and APIs for my app

Hi everyone!

I'm currently developing my own automotive application for Volkswagen Group vehicles (VW, Audi, Skoda, SEAT and CUPRA).

I'm trying to find free or open-source databases, APIs or other resources that provide reliable vehicle information.

I'm particularly interested in:

• VIN decoding and vehicle identification

• Factory equipment and PR codes

• Engine codes and vehicle specifications

• OEM part numbers and compatibility

• Service and maintenance information

• Diagnostic data and ECU information

Does anyone know where I could find this kind of data for free?

Maybe there are some public databases, GitHub projects, open-source tools or APIs that I haven't discovered yet.

I'm especially interested in data that can legally be used in my own application.

If anyone has experience working with VW Group vehicle data or knows where developers can obtain it, I'd really appreciate any advice!

Thanks in advance for your help!

P.S. I accidentally posted my previous question in Polish and couldn't edit it. Sorry for the duplicate!