diff --git a/README.md b/README.md
index e90f17d..29fe5f7 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,20 @@ Ou instale você mesmo:
 Os métodos da API estão disponíveis atraves dos métodos da instancia de um cliente
 
 ```ruby
-  client = Vindi::Client.new(key: 'VINDI_KEY')
+  client = Vindi::Client.new(key: '<sua_vindi_api_key>')
+```
+
+Para testar no ambiente Sandbox, use o endpoint da API para efetuar requisições:
+
+```ruby
+  client = Vindi::Client.new(key: '<sua_vindi_api_key>', api_endpoint: 'https://sandbox-app.vindi.com.br/api/v1')
+```
+
+Caso prefira utilizar variáveis de ambiente para prover credenciais de acesso:
+
+```
+export VINDI_KEY="<sua_vindi_api_key>"
+export VINDI_API_ENDPOINT="https://sandbox-app.vindi.com.br/api/v1"
 ```
 
 ### Consumindo recursos
diff --git a/lib/vindi/version.rb b/lib/vindi/version.rb
index 6e61e12..89e0f63 100644
--- a/lib/vindi/version.rb
+++ b/lib/vindi/version.rb
@@ -1,3 +1,3 @@
 module Vindi
-  VERSION = '0.0.2'
+  VERSION = '0.0.4'
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index ef092d3..561e971 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -2,6 +2,7 @@
 SimpleCov.start
 
 VINDI_STAGING_ENDPOINT = "https://staging-app.vindi.com.br/api/v1/".freeze
+VINDI_SANDBOX_ENDPOINT = "https://sandbox-app.vindi.com.br/api/v1/".freeze
 
 require 'vindi'
 require 'rspec'
diff --git a/spec/vindi/client_spec.rb b/spec/vindi/client_spec.rb
index 0952139..4e1da96 100644
--- a/spec/vindi/client_spec.rb
+++ b/spec/vindi/client_spec.rb
@@ -1,13 +1,14 @@
 require 'spec_helper'
 
 RSpec.describe Vindi::Client do
-  let(:options) { { key: 'xDw3elPwddlzqgFzJqZXkiy-jZlzVvY7L1aVdcDbMHg',
-                    default_media_type: 'application/vnd.api+json' } }
-
+  let(:options) do
+    { key: key, default_media_type: 'application/vnd.api+json' }
+  end
+  let(:key) { 'xDw3elPwddlzqgFzJqZXkiy-jZlzVvY7L1aVdcDbMHg' }
   let(:client) { basic_auth_client }
 
   context 'initialization' do
-    describe 'when initialize a new client' do
+    describe 'when initialize a new client with default settings' do
       it 'overrides default settings' do
         expect(client.key).to eq(options[:key])
         expect(client.default_media_type).to eq(options[:default_media_type])
@@ -22,6 +23,25 @@
         expect(client.default_media_type).to eq(options[:default_media_type])
       end
     end
+
+    describe 'when initializing a client with custom settings' do
+      it 'use sandbox endpoint via class parameters' do
+        api_endpoint = VINDI_SANDBOX_ENDPOINT
+        sandbox_client = Vindi::Client.new(key: key, api_endpoint: api_endpoint)
+
+        expect(sandbox_client.api_endpoint).to eq(api_endpoint)
+      end
+
+      it 'use sandbox endpoint via system variables' do
+        api_endpoint = VINDI_SANDBOX_ENDPOINT
+        ENV['VINDI_API_ENDPOINT'] = api_endpoint
+        ENV['VINDI_KEY'] = key
+        sandbox_client = Vindi::Client.new
+
+        expect(sandbox_client.api_endpoint).to eq(api_endpoint)
+        expect(sandbox_client.key).to eq(key)
+      end
+    end
   end
 
   context 'requests' do