```ruby
module VoodooService
  def self.client
    VoodooSMS.new(
      Settings.voodoo_sms.username,
      Settings.voodoo_sms.password
    )
  end
end
```

Allow username/password to be passed in to VoodooService
user
```ruby
module VoodooService
  def self.client(username: Settings.voodoo_sms.username, password: Settings.voodoo_sms.password)
    VoodooSMS.new username, password
  end
end
```
assistant