diff --git a/upload/system/library/PagSeguro/src/Request/Factory.php b/upload/system/library/PagSeguro/src/Request/Factory.php
new file mode 100644
index 0000000..0a6373c
--- /dev/null
+++ b/upload/system/library/PagSeguro/src/Request/Factory.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace ValdeirPsr\PagSeguro\Request;
+
+use Curl\Curl;
+use ValdeirPsr\PagSeguro\Domains\Environment;
+
+class Factory
+{
+    private const URL_SANDBOX = 'https://ws.sandbox.pagseguro.uol.com.br/';
+    private const URL_PRODUCTION = 'https://ws.pagseguro.uol.com.br/';
+
+    public const USER_AGENT = 'PagSeguro SDK for OpenCart v1.0.0';
+
+    /**
+     * Cria classe para requisição
+     * 
+     * @param Environment $env
+     * 
+     * @return Curl
+     */
+    public static function request(Environment $env): Curl
+    {
+        $instance = new Curl();
+        $instance->setUserAgent(self::USER_AGENT);
+        $instance->setOpt(CURLOPT_SSL_VERIFYPEER, !$env->isSandbox());
+
+        return $instance;
+    }
+
+    /**
+     * Cria uma URL
+     */
+    public static function url(Environment $env, string $path, array $parameters = []): string
+    {
+        return sprintf(
+            '%s%s?%s',
+            $env->isSandbox() ? self::URL_SANDBOX : self::URL_PRODUCTION,
+            ltrim($path, '/'),
+            http_build_query($parameters)
+        );
+    }
+}
diff --git a/upload/system/library/PagSeguro/src/Request/Session.php b/upload/system/library/PagSeguro/src/Request/Session.php
new file mode 100644
index 0000000..bad66c1
--- /dev/null
+++ b/upload/system/library/PagSeguro/src/Request/Session.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace ValdeirPsr\PagSeguro\Request;
+
+use DOMDocument;
+use ValdeirPsr\PagSeguro\Domains\Environment;
+use ValdeirPsr\PagSeguro\Exception\Auth as AuthException;
+
+class Session
+{
+    private $env;
+
+    public function __construct(Environment $env)
+    {
+        $this->env = $env;
+    }
+
+    /**
+     * Gera uma sessão
+     * 
+     * @throws AuthException Caso as credenciais sejam inválidas
+     * 
+     * @return string
+     */
+    public function generate(): string
+    {
+        $url = $this->buildUrl();
+
+        $request = Factory::request($this->env);
+        $request->post($url);
+        $request->close();
+
+        if ($request->isSuccess()) {
+            $xml = $request->getResponse();
+            $dom = new DOMDocument();
+            $dom->loadXml($xml);
+
+            $session = $dom->getElementsByTagName('id');
+
+            if ($session->count() > 0) {
+                return trim($session->item(0)->textContent);
+            }
+        } elseif ($request->getHttpStatus() === 401) {
+            throw new AuthException('Check your credentials', 1000);
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function buildUrl(): string
+    {
+        return Factory::url($this->env, 'v2/sessions', [
+            'email' => $this->env->getEmail(),
+            'token' => $this->env->getToken()
+        ]);
+    }
+}
diff --git a/upload/system/library/PagSeguro/tests/unit/Request/FactoryTest.php b/upload/system/library/PagSeguro/tests/unit/Request/FactoryTest.php
new file mode 100644
index 0000000..f040574
--- /dev/null
+++ b/upload/system/library/PagSeguro/tests/unit/Request/FactoryTest.php
@@ -0,0 +1,38 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use ValdeirPsr\PagSeguro\Domains\Environment;
+use ValdeirPsr\PagSeguro\Request\Factory;
+use Curl\Curl;
+
+class FactoryTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function newInstance()
+    {
+        $env = Environment::sandbox('pagseguro@valdeir.dev', '1234567890');
+        $instance = Factory::request($env);
+
+        $this->assertInstanceOf(Curl::class, $instance);
+        $this->assertEquals('PagSeguro SDK for OpenCart v1.0.0', Factory::USER_AGENT);
+    }
+
+    /**
+     * @test
+     */
+    public function checkUrlBuilder()
+    {
+        $expected = 'https://ws.sandbox.pagseguro.uol.com.br/checkout/v2/installments.json?sessionId=0123456789&amount=1000.00&creditCardBrand=master';
+
+        $env = Environment::sandbox('pagseguro@valdeir.dev', '1234567890');
+        $url = Factory::url($env, 'checkout/v2/installments.json', [
+            'sessionId' => '0123456789',
+            'amount' => '1000.00',
+            'creditCardBrand' => 'master'
+        ]);
+
+        $this->assertEquals($expected, $url);
+    }
+}
diff --git a/upload/system/library/PagSeguro/tests/unit/Request/SessionTest.php b/upload/system/library/PagSeguro/tests/unit/Request/SessionTest.php
new file mode 100644
index 0000000..66175a2
--- /dev/null
+++ b/upload/system/library/PagSeguro/tests/unit/Request/SessionTest.php
@@ -0,0 +1,62 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use ValdeirPsr\PagSeguro\Domains\Environment;
+use ValdeirPsr\PagSeguro\Request\Factory;
+use ValdeirPsr\PagSeguro\Request\Session;
+use ValdeirPsr\PagSeguro\Exception\Auth as AuthException;
+
+class SessionTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function newInstance()
+    {
+        $env = Environment::sandbox('pagseguro@valdeir.dev', '1234567890');
+        $instance = new Session($env);
+
+        $this->assertInstanceOf(Session::class, $instance);
+    }
+
+    /**
+     * @test
+     */
+    public function generatingANewSessionWithValidDataShouldNotReturnAnError()
+    {
+        $env = Environment::sandbox('pagseguro@valdeir.dev', '');
+
+        $stub = $this->getMockBuilder(Session::class)
+            ->setConstructorArgs([$env])
+            ->setMethods(['buildUrl'])
+            ->getMock();
+
+        $stub->expects($this->any())
+            ->method('buildUrl')
+            ->willReturn('https://f3528d51-6219-4b80-8bd3-3ab112b8094f.mock.pstmn.io/v2/sessions/valid');
+
+        $result = $stub->generate();
+        $this->assertNotNull($result);
+    }
+
+    /**
+     * @test
+     */
+    public function whenEnteringInvalidCredentialsShouldReturnAnError()
+    {
+        $this->expectException(AuthException::class);
+        
+        $env = Environment::sandbox('pagseguro@valdeir.dev', '');
+
+        $stub = $this->getMockBuilder(Session::class)
+            ->setConstructorArgs([$env])
+            ->setMethods(['buildUrl'])
+            ->getMock();
+
+        $stub->expects($this->any())
+            ->method('buildUrl')
+            ->willReturn('https://f3528d51-6219-4b80-8bd3-3ab112b8094f.mock.pstmn.io/v2/sessions/invalid');
+
+        $stub->generate();
+    }
+}