Hey everyone,

I'm currently learning Rust and not a professional developer — this crate is part of my journey to level up in idiomatic Rust and API design. I started out with Python and stumbled into Rust last year, and after building a few small tools, I’ve completely fallen for the language.

This time around, I put together a wrapper for the OpenFIGI API to simplify the process of mapping instrument identifiers like FIGI, ISIN, and CUSIP. I built the client semi-manually using reqwest and serde. Link: NotAProfDev/openfigi-rs: A modern, strongly-typed Rust client for the OpenFIGI API

I know this is a pretty general request, but I’d really appreciate a code review and any feedback you’re willing to share to help me improve — especially around:

• Whether I'm writing Rust idiomatically
• Struct and error handling design
• Usability and ergonomics of the API
• CI setup and testing best practices
• Anything that could be cleaner, more robust, or more maintainable

Thanks so much in advance!

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