You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: configuration.rb
    path of file: ./repos/gitlabhq/gems/error_tracking_open_api/lib/error_tracking_open_api
    
    the code of the file until where you have to start completion: =begin
#Error Tracking REST API

#This schema describes the API endpoints for the error tracking feature

The version of the OpenAPI document: 0.0.1

Generated b
    
    def api_key_with_prefix(param_name, param_alias = nil)
      key = @api_key[param_name]
      key = @api_key.fetch(param_alias, key) unless param_alias.nil?
      if @api_key_prefix[param_name]
        "#{@api_key_prefix[param_name]} #{key}"
      else
        key
      end