def service_wsdl(environment, service)
			if (ENVIRONMENTS.include?(environment.to_s))
				if @config['wsdl'][environment.to_s].include?(service.to_s)
					return @config['wsdl'][environment.to_s][service.to_s]
				end
				raise "Unknown service '#{service.to_s}'. Available services: #{@config['wsdl'][environment.to_s].keys.join(", ")}"
			end
			raise "Invalid environment: #{environment}. Value should be 'sandbox' or 'production'"
		end
def service_wsdl(environment, service)
			if (ENVIRONMENTS.include?(environment.to_s))
				if @config['wsdl'][environment.to_s].include?(service.to_s)
					return @config['wsdl'][environment.to_s][service.to_s]
				end
				raise "Unknown service '#{service.to_s}'. Available services: #{@config['wsdl'][environment.to_s].keys.join(", ")}"
			end
			raise "Invalid environment: #{environment}. Value should be 'sandbox' or 'production'"
		end
Public : Returns a String with WSDL url for the service indicated

 Author:: jlopezn@neonline.cl

 === Parameters
 environment - Bing Environment: 'sandbox' or 'production'
 service - service name

 === Examples
   config.service_wsdl(:sandbox, :campaign_management)
   # => "https://api.sandbox.bingads.microsoft.com/Api/Advertiser/CampaignManagement/v9/CampaignManagementService.svc?singleWsdl"

 Returns:: returns
 Raises:: exception