Add response of oxxo cancel

@@ -199,15 +199,18 @@ module ActsAsChargeable
                        var_payment_at: Time.zone.at(charge.paid_at))
         return { error_message: 'Already paid' }
       end
-      clean_var_variables
     end
 
     private
 
     def clean_var_variables
-      update_columns(var_status: nil, var_barcode: nil, var_barcode_url: nil,
+      if update_columns(var_status: nil, var_barcode: nil, var_barcode_url: nil,
                         var_id: nil, var_service: nil, var_payment_at: nil,
                         var_payment_expires_at: nil)
+        { object: self }
+      else
+        { error_message: 'Something went wrong' }
+      end
     end
   end
 end

 # Var Version
 module Var
-  VERSION = '0.2.17'
+  VERSION = '0.2.18'
 end