1_webhook_service.rb

# All class methods (original)
# Usage: Mailjet::WebhookService::Event.all

module Mailjet
  module WebhookService
    class Base
      class << self
        def domain(prefix=nil)
        end

        def webhook_url_for(path)
        end
      end
    end

    # Wrapper around Mailjet Event API calls
    class Event < Base
      class << self
        def all
        end

        def create(event:, path:)
        end

        def clear
        end
      end
    end

    # Wrapper around Mailjet Parse API calls
    class Parse < Base
      class << self
        def all
        end

        def create(prefix:, path:)
        end

        def clear(prefix:)
        end
      end
    end
  end
end

2_webhook_service.rb

# Self extended modules (alternative)
# Usage: Mailjet::WebhookService::Event.all

module Mailjet
  module WebhookService
    module Base
      private

      def domain(prefix=nil)
      end

      def webhook_url_for(path)
      end
    end

    # Wrapper around Mailjet Event API calls
    module Event
      include Base
      extend self
      
      def all
      end

      def create(event:, path:)
      end

      def clear
      end
    end

    # Wrapper around Mailjet Parse API calls
    module Parse
      include Base
      extend self

      def all
      end

      def create(prefix:, path:)
      end

      def clear(prefix:)
      end
    end
  end
end

3_webhook_service.rb

# Singleton instances (alternative)
# Usage: Mailjet::WebhookService.event.all

module Mailjet
  module WebhookService
    class Base
      private
      
      def domain(prefix=nil)
      end

      def webhook_url_for(path)
      end
    end

    # Wrapper around Mailjet Event API calls
    class Event < Base
      def all
      end

      def create(event:, path:)
      end

      def clear
      end
    end

    # Wrapper around Mailjet Parse API calls
    class Parse < Base
      def all
      end

      def create(prefix:, path:)
      end

      def clear(prefix:)
      end
    end
    
    def self.event = @event ||= Event.new
    def self.parse = @parse ||= Parse.new
  end
end