diff --git a/README.md b/README.md
index 49b4c8a..cc0dddb 100644
--- a/README.md
+++ b/README.md
@@ -20,20 +20,20 @@ Or install it yourself as:
 
 ## Usage
 
-1. Initialization : `LemonWay::Client.new(api_params, client_config_options, &client_config_block)`  
-  - `api_options` (Hash) : mandatory hash where are passed the api param you want to reapeat every client query + the `:wsdl` uri  
-  - `client_config_options` (Hash) : optional hash passed to savon to build its [global options](https://github.com/savonrb/savon/blob/master/lib/savon/options.rb) used by the client on every query 
-  - `client_config_block` (Block) : optional block to customize the savon client, takes a [savon global options](https://github.com/savonrb/savon/blob/master/lib/savon/options.rb) instance as param    
+1. Initialization : `LemonWay::Client.new(api_params, client_config_options, &client_config_block)`
+  - `api_options` (Hash) : mandatory hash where are passed the api param you want to reapeat every client query + the `:wsdl` uri
+  - `client_config_options` (Hash) : optional hash passed to savon to build its [global options](https://github.com/savonrb/savon/blob/master/lib/savon/options.rb) used by the client on every query
+  - `client_config_block` (Block) : optional block to customize the savon client, takes a [savon global options](https://github.com/savonrb/savon/blob/master/lib/savon/options.rb) instance as param
   ```ruby
 client = LemonWay::Client.new({wsdl:  "https://ws.lemonway.fr/[...]/service.asmx?wsdl"}, {ssl_verify_mode: :none})
 #is the same as
 client = LemonWay::Client.new wsdl:  "https://ws.lemonway.fr/[...]/service.asmx?wsdl" do |opts|
   opts.ssl_verify_mode(:none)
-end  
+end
   ```
- 
+
 2. Query the API directly calling the method on the client instance : `client.api_method_name(params, client_config_override, &client_block_config_override)`
-  - `api_method_name` : Lemonway underscorized mehtod name (refer to the Lemonway doc or to `client.operations` to list them 
+  - `api_method_name` : Lemonway underscorized mehtod name (refer to the Lemonway doc or to `client.operations` to list them
   - `params` (Hash) : params sent to the api, keys will be camelcased to comply with the SOAP convention used by Lemonway
   - `client_config_override` (Hash) : A hash of config transmitted to the savon client, which overrides the [savon global config](https://github.com/savonrb/savon/blob/master/lib/savon/options.rb) for the current api call only
   - `client_block_config_override` (Block) : A Block taking a [savon global options](https://github.com/savonrb/savon/blob/master/lib/savon/options.rb) instance as param, to override the client call configuration options
@@ -44,36 +44,112 @@ end
 
 ```ruby
 # initialize the client
-client = LemonWay::Client.new wsdl:  "https://ws.lemonway.fr/mb/ioio/dev/directkit/service.asmx?wsdl",
+  # at the end of url the `?wsdl` is realy important
+# config/initializers/lemonway.rb
+CLIENT_LEMON = Lemonway::Client.new wsdl:  "https://ws.lemonway.fr/mb/ioio/dev/directkit/service.asmx?wsdl",
                               wl_login: "test",
                               wl_pass: "test",
                               language: "fr",
-                              version: "1.1",
-                              wallet_ip: "127.0.0.1"
-
-# list the available operations as follow : 
-resp = client.operations
-=> [:register_wallet,
- :update_wallet_details,
- :update_wallet_status,
- :register_iban,
- :register_sdd_mandate,
- :register_card,
- ...
- ]
+                              version: "1.1"
+
+# list the available operations as follow :
+  CLIENT_LEMON.operations
+  => [:register_wallet,
+   :update_wallet_details,
+   :update_wallet_status,
+   :register_iban,
+   :register_sdd_mandate,
+   :register_card,
+   ...
+   ]
+
+
 
 # requests takes underscored names, and undescored (or camelcased) options, some hash with indifferent access are returned
-resp = client.register_wallet,  wallet: "123",
-                                client_mail:        "nico@las.com",
-                                client_first_name:  "nicolas",
-                                client_last_name:   "nicolas",
-                                wallet_ip: "127.0.0.1"
-=> {id: '123', lwid: "98098"}
-resp[:id] == resp['id'] == '123'
+
+# You need to send the IP of your client, to have it available everywhere do :
+  # application_controller
+
+  before_filter :get_request
+
+    def get_request
+      $request = request
+    end
+
+
+# models/user
+  after_create :create_lw_account
+
+  private
+  def create_lw_account
+    resp = CLIENT_LEMON = client.register_wallet(wallet: "123",
+                                clientMail:        "nico@las.com",
+                                clientFirstName:  "nicolas",
+                                clientLastName:   "nicolas",
+                                payerOrBeneficiary: 1,
+                                wallet_ip: $request.remote_ip,
+                                )
+    => {id: '123', lwid: "98098"}
+
+    # Save the lwid in database
+      resp[:id] == resp['id'] == '123'
+      user = self.update(lwid: resp[:id])
+      ########################
+     # Save the :id and not the :lwid, because it's this one that you need for the call after #
+      ##########################
+  end
+
+
+```
+
+```ruby
+# Wallet option :
+  # Get wallet details
+  CLIENT_LEMON.get_wallet_details(wallet: 'id(string)', email:"email(string)")
+
 
 ```
 
-Please refer to the Lemonway documentation for the complete list of methods and their parameters, or query https://ws.lemonway.fr/mb/[YOUR_LEMONWAY_NAME]/dev/directkitxml/service.asmx if Lemonway has provided you a development account 
+```ruby
+  # For crowdfunding
+    # Create like classic user, but add need option, exemple :  Debtor, (value = 1 if debtor) (example for project)
+
+
+    def contribution
+      # First initialise the webkit
+
+      fill_user_wallet = CLIENT_LEMON.money_in_web_init(
+        wallet: current_user.lwid,
+        amountTot: @contribution.amount.to_f,
+        wkToken: @contribution.id,
+        returnUrl: after_payment_url,
+        errorUrl: after_payment_url,
+        cancelUrl: after_payment_url,
+        autoCommission: 0,
+        wallet_ip: $request.remote_ip)
+
+          # define in your routes.rb the root of after_payment
+
+      # Then call the webkit :
+
+      redirect_to(ENV['LW_WEBKIT'] + "?moneyInToken=#{fill_user_wallet[:moneyinweb][:token]}")
+    end
+
+    # And after_payment :
+
+    def after_payment
+      CLIENT_LEMON.get_money_in_trans_details(transactionMerchantToken: params[:response_wkToken], wallet_ip: $request.remote_ip)
+
+      # redirect where you want
+    end
+
+
+```
+
+
+
+
+Please refer to the Lemonway documentation for the complete list of methods and their parameters, or query https://ws.lemonway.fr/mb/[YOUR_LEMONWAY_NAME]/dev/directkitxml/service.asmx if Lemonway has provided you a development account
 
 
 ## Contributing
diff --git a/lib/lemonway/client.rb b/lib/lemonway/client.rb
index 329ab56..70edf37 100644
--- a/lib/lemonway/client.rb
+++ b/lib/lemonway/client.rb
@@ -5,15 +5,22 @@
 module Lemonway
   class Client
 
-    class Error < StandardError; end
+    class Error < StandardError
+      attr_reader :code
+
+      def initialize(code: nil, message:)
+        super(message)
+        @code = code
+      end
+    end
 
     attr_accessor :instance
 
     def initialize api_opts={}, client_opts={}, &block
       [api_opts, client_opts].each(&:symbolize_keys!)
 
-      @xml_mini_backend = client_opts.delete(:xml_mini_backend)                        || ActiveSupport::XmlMini_REXML
-      @entity_expansion_text_limit = client_opts.delete(:entity_expansion_text_limit)  || 10**20
+      @xml_mini_backend = client_opts.delete(:xml_mini_backend) || ActiveSupport::XmlMini_REXML
+      @entity_expansion_text_limit = client_opts.delete(:entity_expansion_text_limit) || 10**20
 
       @instance = Savon.client client_opts.update(wsdl: api_opts.delete(:wsdl)), &block
 
@@ -42,7 +49,7 @@ def client_call method_name, message_opts = {}, client_opts = {}, &block
       result = result.underscore_keys(true).with_indifferent_access
 
       if result.key?(:e)
-        raise Error, [result.fetch(:e).try(:fetch, :code), result.fetch(:e).try(:fetch, :msg)].join(' : ')
+        raise Error, code: result.fetch(:e).try(:fetch, :code), message: result.fetch(:e).try(:fetch, :msg)
       elsif result.key?(:trans)
         result[:trans].fetch(:hpay, result[:trans])
       elsif result.key?(:wallet)
@@ -53,7 +60,7 @@ def client_call method_name, message_opts = {}, client_opts = {}, &block
 
     rescue KeyError => e
       #todo improve this message
-      raise Error, "#{e.message}, expected `#{method_name}_response.#{method_name}_result` but got : #{resp.body.inspect}"
+      raise Error, message: "#{e.message}, expected `#{method_name}_response.#{method_name}_result` but got : #{resp.body.inspect}"
     end
 
     # work around for
diff --git a/lib/lemonway/version.rb b/lib/lemonway/version.rb
index 9cc407d..76b4499 100644
--- a/lib/lemonway/version.rb
+++ b/lib/lemonway/version.rb
@@ -1,4 +1,3 @@
 module Lemonway
-  VERSION = "1.0.1"
-
+  VERSION = "1.0.3"
 end