I’ve worked on a Stripe SDK (Stripe — Striped v0.5.0) though the code is now merged with the StripityStripe library. It generates the code from the api spec at compile time.
Also found that it is finicky, all public open api schemas seem to do things a little differently if you want to generate an idiomatic sdk. E.g Stripe doesn’t use the tags functionality of the spec which would have been useful. So, the customisability your library has is a big plus here.
