9.0.0

• Breaking Dropped support for Node.js 18 and 20. The minimum supported version is
  now 22.
• Breaking Dropped commonjs support. The package is now only available as an ES module.
• Breaking Errors from the web service client are now thrown as
  WebServiceError instances, which extend Error, rather than as plain
  objects. The code, error, status, and url properties are preserved,
  so existing field access continues to work, but the thrown value is now an
  Error. The original error is now preserved as the standard cause
  property (for example, the network error behind a FETCH_ERROR). The
  WebServiceError and ArgumentError classes and the WebServiceClientError
  type are now exported from the package.
• Breaking The WebServiceClient constructor now takes an options object as
  its third argument ({ timeout, host, fetcher }) instead of positional
  timeout and host arguments. For backward compatibility a number may still
  be passed and is treated as the timeout; callers that passed host
  positionally must change to { host }, and passing a fourth positional
  argument now throws an ArgumentError rather than being silently ignored. The
  new fetcher option accepts a custom fetch implementation, useful for
  routing requests through a proxy or custom dispatcher, or for testing. The
  WebServiceClientOptions type is exported from the package.
• The code property on WebServiceError and the WebServiceClientError
  interface is now typed as WebServiceErrorCode
  (ClientErrorCode | (string & {})) instead of string, providing
  autocompletion for the client-generated codes while still accepting any code
  returned by the web service. The ClientErrorCode and WebServiceErrorCode
  types are exported from the package.
• ArgumentError now accepts an optional cause and forwards it to Error.
• customInputs on Transaction may now be provided as a plain object mapping
  keys to values, in addition to an array of CustomInput instances.
• Removed the validator dependency. Email and domain validation now use
  built-in regex helpers, and the order referrer URI is validated with the
  URL constructor (restricted to http/https). Validation of a few
  uncommon email edge cases may differ slightly.
• Fixed a bug where serializing a Transaction (e.g. when sending a request)
  mutated the Billing, Shipping, CreditCard, and Order objects passed
  to it.
• Added the input /device/tracking_token. This is the token generated by
  the Device Tracking Add-on
  for explicit device linking. You may provide this by providing
  trackingToken to Device.
• Added FatZebra to the Processor enum.
• Added CLEAR to the Tag enum for use with the Report Transaction API.