@btx-tools SDK — BTX service-challenge admission control
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    StringOrFn:
        | string
        | ((c: Context) => string)
        | ((c: Context) => Promise<string>)

    Resolver for purpose/resource/subject. Can be a static string, a sync function over Context, or an async function for cases where the resolver needs to await c.req.json() (Hono request body is a stream until consumed).