diff --git a/lib/catarse_pagarme/configuration.rb b/lib/catarse_pagarme/configuration.rb
index <HASH>..<HASH> 100644
--- a/lib/catarse_pagarme/configuration.rb
+++ b/lib/catarse_pagarme/configuration.rb
@@ -1,9 +1,11 @@
 module CatarsePagarme
   class Configuration
-    attr_accessor :api_key
+    attr_accessor :api_key, :slip_tax, :credit_card_tax
 
     def inititalizer
       @api_key = ''
+      @slip_tax = 0
+      @credit_card_tax = 0
     end
   end
 end
added slip_tax and credit_card_tax into configuration for get the fee