README Example Doesn't Work

[peter-chung-xfers]

This example about on_behalf_of in README doesn't work

pry(main)> CurrencyCloud::Account.create(account_name: 'My Test User', on_behalf_of: "bafd5d45-6d76-4f6f-b816-865b06a96ccf")
CurrencyCloud::BadRequestError: CurrencyCloud::BadRequestError
---
platform: ruby-2.5.8
request:
  parameters:
    account_name: My Test User
    on_behalf_of: bafd5d45-6d76-4f6f-b816-865b06a96ccf
  verb: post
  url: https://devapi.currencycloud.com/v2/accounts/create
response:
  status_code: 400
  date: Wed, 24 Aug 2022 09:33:06 GMT
  request_id: 0
errors:
- field: base
  code: invalid_extra_parameters
  message: Invalid extra parameters:'{:on_behalf_of=>"bafd5d45-6d76-4f6f-b816-865b06a96ccf"}'
  params:
    parameters:
      on_behalf_of: bafd5d45-6d76-4f6f-b816-865b06a96ccf

from /home/peter/.rvm/gems/ruby-2.5.8/gems/currency_cloud-1.1.4/lib/currency_cloud/response_handler.rb:32:in `handle_failure'