```ruby
require 'gds_api/publishing_api_v2'

module Services
  def self.publishing_api
    @publishing_api ||= GdsApi::PublishingApiV2.new(Plek.new.find('publishing-api'))
  end
end
```

Add bearer_token for publishing API authentication
user
```ruby
require 'gds_api/publishing_api_v2'

module Services
  def self.publishing_api
    @publishing_api ||= GdsApi::PublishingApiV2.new(
      Plek.new.find('publishing-api'),
      bearer_token: ENV['PUBLISHING_API_BEARER_TOKEN'] || 'example'
    )
  end
end
```
assistant