```ruby
require 'gds_api/publishing_api_v2'
require 'gds_api/content_store'
require 'gds_api/link_checker_api'

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

  def self.content_store
    @content_store ||= GdsApi::ContentStore.new(
      Plek.new.find('content-store'),
      disable_cache: true
    )
  end

  def self.link_checker_api
    @link_checker_api ||= GdsApi::LinkCheckerApi.new(
      Plek.new.find("link-checker-api")
    )
  end
end
```

Add bearer tokens for link-checker-api authentication
user
```ruby
require 'gds_api/publishing_api_v2'
require 'gds_api/content_store'
require 'gds_api/link_checker_api'

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

  def self.content_store
    @content_store ||= GdsApi::ContentStore.new(
      Plek.new.find('content-store'),
      disable_cache: true
    )
  end

  def self.link_checker_api
    @link_checker_api ||= GdsApi::LinkCheckerApi.new(
      Plek.new.find("link-checker-api"),
      bearer_token: ENV['LINK_CHECKER_API_BEARER_TOKEN'],
    )
  end
end
```
assistant