Checks the validity of a pkpass file by checking its signature and contents match the Apple specification. It's hosted on Azure (at my own expense) but I wanted to post the code here, so people can a) see what it does and b) can contribute to the validation it performs.
Questions pop up on StackOverflow about invalid passes and the cause, usually, is a problem in the payload. This project represents my attempt to help developer diagnose the issues themselves.
The project is available at https://pkpassvalidator.azurewebsites.net and can be used right now. I'll extend its capabilities over time.
If you find this utility useful, please consider donating by buying me a coffee - https://www.buymeacoffee.com/fMKJ2NnQ3