Migrating from v1

v2 is a ground-up rewrite; v1’s hand-written wrapper is gone.

v1	v2
new Brex(token)	new Brex({ token })
brex.request({ endpoint, method, … })	Typed methods, e.g. brex.vendors.list()
brex.vendors.list() (partial coverage)	Full coverage of all 10 published APIs
isomorphic-unfetch polyfill	Native fetch, zero dependencies
CommonJS + ESM	ESM-only (Node ≥ 20.19 require() still works)

What to change

1. Construct with an options object — new Brex({ token }) instead of new Brex(token).
2. Replace raw request(...) calls with the typed namespace methods. Browse the API reference to find the method that maps to your old endpoint.
3. Drop the fetch polyfill — v2 uses the runtime’s native fetch. If you’re on a runtime without one, inject a fetch via the client options.
4. Expect ESM — the package is ESM-only. require("brex") still works on Node ≥ 20.19 via require(esm).