diff --git a/.gitignore b/.gitignore
index 69eb48f..18a8e60 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,4 @@ bin/
 config/*yml
 pkg/
 *.log
-*.gem
+*.gem
\ No newline at end of file
diff --git a/lib/mercadopago.rb b/lib/mercadopago.rb
index dc2b67b..40b62d9 100644
--- a/lib/mercadopago.rb
+++ b/lib/mercadopago.rb
@@ -1,53 +1,53 @@
-
-require 'rubygems'
-require 'json'
-require 'uri'
-require 'net/https'
-require 'yaml'
-require File.dirname(__FILE__) + '/version'
-require 'ssl_options_patch'
-require 'card'
-require 'cardtoken'
-require 'customer'
-require 'discountcampaign'
-require 'genericcall'
-require 'identificationtype'
-require 'merchantorder'
-require 'payment'
-require 'preference'
-
-class MercadoPago
-	attr_reader :card, :cardtoken, :customer, :discountcampaign, :genericcall, :identificationtype, :merchantorder, :payment, :preference
-	@@sandbox = false
-	def initialize(*args)
-		if args.size < 1 or args.size > 2
-			raise "Invalid arguments. Use CLIENT_ID and CLIENT SECRET, or ACCESS_TOKEN"
-		end
-
-		@client_id = args.at(0) if args.size == 2
-		@client_secret = args.at(1) if args.size == 2
-		@ll_access_token = args.at(0) if args.size == 1
-
-		@card = Card.new(@client_id, @client_secret, @ll_access_token)
-		@cardtoken = CardToken.new(@client_id, @client_secret, @ll_access_token)
-		@customer = Customer.new(@client_id, @client_secret, @ll_access_token)
-		@discountcampaign = DiscountCampaign.new(@client_id, @client_secret, @ll_access_token)
-		@genericcall = GenericCall.new(@client_id, @client_secret, @ll_access_token)
-		@identificationtype = IdentificationType.new(@client_id, @client_secret, @ll_access_token)
-		@merchantorder = MerchantOrder.new(@client_id, @client_secret, @ll_access_token)
-		@payment = Payment.new(@client_id, @client_secret, @ll_access_token)
-		@preference = Preference.new(@client_id, @client_secret, @ll_access_token)
-	end
-
-	def sandbox_mode(enable=nil)
-		if not enable.nil?
-			@@sandbox = enable
-		end
-
-		return @@sandbox
-	end
-
-	def self.sandbox
-		@@sandbox
-	end
-end
+
+require 'rubygems'
+require 'json'
+require 'uri'
+require 'net/https'
+require 'yaml'
+require File.dirname(__FILE__) + '/version'
+require 'ssl_options_patch'
+require 'card'
+require 'cardtoken'
+require 'customer'
+require 'discountcampaign'
+require 'genericcall'
+require 'identificationtype'
+require 'merchantorder'
+require 'payment'
+require 'preference'
+
+class MercadoPago
+	attr_reader :card, :cardtoken, :customer, :discountcampaign, :genericcall, :identificationtype, :merchantorder, :payment, :preference
+	@@sandbox = false
+	def initialize(*args)
+		if args.size < 1 or args.size > 2
+			raise "Invalid arguments. Use CLIENT_ID and CLIENT SECRET, or ACCESS_TOKEN"
+		end
+
+		@client_id = args.at(0) if args.size == 2
+		@client_secret = args.at(1) if args.size == 2
+		@ll_access_token = args.at(0) if args.size == 1
+
+		@card = Card.new(@client_id, @client_secret, @ll_access_token)
+		@cardtoken = CardToken.new(@client_id, @client_secret, @ll_access_token)
+		@customer = Customer.new(@client_id, @client_secret, @ll_access_token)
+		@discountcampaign = DiscountCampaign.new(@client_id, @client_secret, @ll_access_token)
+		@genericcall = GenericCall.new(@client_id, @client_secret, @ll_access_token)
+		@identificationtype = IdentificationType.new(@client_id, @client_secret, @ll_access_token)
+		@merchantorder = MerchantOrder.new(@client_id, @client_secret, @ll_access_token)
+		@payment = Payment.new(@client_id, @client_secret, @ll_access_token)
+		@preference = Preference.new(@client_id, @client_secret, @ll_access_token)
+	end
+
+	def sandbox_mode(enable=nil)
+		if not enable.nil?
+			@@sandbox = enable
+		end
+
+		return @@sandbox
+	end
+
+	def self.sandbox
+		@@sandbox
+	end
+end