diff --git a/.editorconfig b/.editorconfig
index c1e2c64..e795376 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -10,3 +10,6 @@ end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
+
+[*.yaml]
+indent_size = 2
diff --git a/.github/workflows/static-analysis.yaml b/.github/workflows/static-analysis.yaml
new file mode 100644
index 0000000..f763077
--- /dev/null
+++ b/.github/workflows/static-analysis.yaml
@@ -0,0 +1,14 @@
+name: static analysis
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  tests:
+    uses: laravel/.github/.github/workflows/static-analysis.yml@main
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
new file mode 100644
index 0000000..33e6e49
--- /dev/null
+++ b/.github/workflows/tests.yaml
@@ -0,0 +1,24 @@
+name: Tests
+
+on: ["push", "pull_request"]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.2
+          tools: composer:v2
+          coverage: xdebug
+
+      - name: Install Dependencies
+        run: composer install --no-interaction --prefer-dist --optimize-autoloader
+
+      - name: Tests
+        run: ./vendor/bin/pest
diff --git a/.gitignore b/.gitignore
index b840dac..2328e65 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
 vendor
+tools
 test.php
 *.cache
+*.txt
+*.lock
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5721ee1
--- /dev/null
+++ b/README.md
@@ -0,0 +1,29 @@
+## IPay Unoffical Client
+
+```php
+<?php
+
+declare(strict_types=1);
+
+use IPay\IPayClient;
+
+require __DIR__.'/vendor/autoload.php';
+
+$ipay = IPayClient::create();
+
+try {
+    $session = $ipay->guest()->login([
+        'userName' => 'yourUsername',
+        'accessCode' => 'yourPassword'
+    ]);
+
+    foreach ($session->historyTransactions([
+        'accountNumber' => $session->customer->accountNumber,
+        'startDate' => new \DateTimeImmutable('-5 days'),
+    ]) as $transaction) {
+        echo $transaction->remark.PHP_EOL;
+    }
+} catch (Throwable $e) {
+    echo $e->getMessage();
+}
+```
diff --git a/composer.json b/composer.json
index 62382b4..9405a6e 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,8 @@
     "type": "library",
     "license": "MIT",
     "autoload": {
-        "classmap": ["src"]
+        "classmap": ["src"],
+        "files": ["src/functions.php"]
     },
     "authors": [
         {
@@ -12,22 +13,28 @@
             "email": "thanh1101dev@gmail.com"
         }
     ],
-    "minimum-stability": "dev",
+    "minimum-stability": "stable",
     "prefer-stable": true,
     "require": {
         "php-http/httplug": "^2.4",
         "php-http/client-common": "^2.7",
         "nette/utils": "^4.0",
-        "league/object-mapper": "dev-main"
+        "eventsauce/object-hydrator": "^1.4",
+        "symfony/options-resolver": "^7.1",
+        "symfony/dom-crawler": "^7.1",
+        "phpseclib/phpseclib": "^2.0",
+        "symfony/var-exporter": "^7.1"
     },
     "require-dev": {
         "php-http/curl-client": "^2.3",
         "nyholm/psr7": "^1.8",
-        "phpstan/phpstan": "^1.11"
+        "phpstan/phpstan": "^1.11",
+        "pestphp/pest": "^2.34"
     },
     "config": {
         "allow-plugins": {
-            "php-http/discovery": true
+            "php-http/discovery": true,
+            "pestphp/pest-plugin": true
         }
     }
 }
diff --git a/composer.lock b/composer.lock
deleted file mode 100644
index 569b372..0000000
--- a/composer.lock
+++ /dev/null
@@ -1,1140 +0,0 @@
-{
-    "_readme": [
-        "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
-        "This file is @generated automatically"
-    ],
-    "content-hash": "aea4d0667f4344934e73e1531cdcdf2e",
-    "packages": [
-        {
-            "name": "clue/stream-filter",
-            "version": "v1.7.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/clue/stream-filter.git",
-                "reference": "049509fef80032cb3f051595029ab75b49a3c2f7"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/clue/stream-filter/zipball/049509fef80032cb3f051595029ab75b49a3c2f7",
-                "reference": "049509fef80032cb3f051595029ab75b49a3c2f7",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^9.6 || ^5.7 || ^4.8.36"
-            },
-            "type": "library",
-            "autoload": {
-                "files": [
-                    "src/functions_include.php"
-                ],
-                "psr-4": {
-                    "Clue\\StreamFilter\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Christian Lück",
-                    "email": "christian@clue.engineering"
-                }
-            ],
-            "description": "A simple and modern approach to stream filtering in PHP",
-            "homepage": "https://github.com/clue/stream-filter",
-            "keywords": [
-                "bucket brigade",
-                "callback",
-                "filter",
-                "php_user_filter",
-                "stream",
-                "stream_filter_append",
-                "stream_filter_register"
-            ],
-            "support": {
-                "issues": "https://github.com/clue/stream-filter/issues",
-                "source": "https://github.com/clue/stream-filter/tree/v1.7.0"
-            },
-            "funding": [
-                {
-                    "url": "https://clue.engineering/support",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/clue",
-                    "type": "github"
-                }
-            ],
-            "time": "2023-12-20T15:40:13+00:00"
-        },
-        {
-            "name": "league/object-mapper",
-            "version": "dev-main",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/thephpleague/object-mapper.git",
-                "reference": "9cbcd21f3ce81aa2d614f65347f6abc901941ea7"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/object-mapper/zipball/9cbcd21f3ce81aa2d614f65347f6abc901941ea7",
-                "reference": "9cbcd21f3ce81aa2d614f65347f6abc901941ea7",
-                "shasum": ""
-            },
-            "require": {
-                "ext-fileinfo": "*",
-                "php": "^8.1"
-            },
-            "require-dev": {
-                "friendsofphp/php-cs-fixer": "^3.4",
-                "league/construct-finder": "^1.1",
-                "phpbench/phpbench": "^1.2",
-                "phpstan/phpstan": "^1.7",
-                "phpunit/phpunit": "^10.0.0",
-                "ramsey/uuid": "^4.2"
-            },
-            "suggest": {
-                "league/construct-finder": "Find all classes in a directory for the best dumped hydrators."
-            },
-            "default-branch": true,
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "League\\ObjectMapper\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Frank de Jonge",
-                    "email": "info@frankdejonge.nl"
-                }
-            ],
-            "description": "Converts structured data into strict objects.",
-            "keywords": [
-                "construction",
-                "constructor",
-                "hydration",
-                "mapper"
-            ],
-            "support": {
-                "issues": "https://github.com/thephpleague/object-mapper/issues",
-                "source": "https://github.com/thephpleague/object-mapper/tree/main"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/frankdejonge",
-                    "type": "github"
-                }
-            ],
-            "time": "2023-12-16T09:26:10+00:00"
-        },
-        {
-            "name": "nette/utils",
-            "version": "v4.0.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/nette/utils.git",
-                "reference": "d3ad0aa3b9f934602cb3e3902ebccf10be34d218"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/nette/utils/zipball/d3ad0aa3b9f934602cb3e3902ebccf10be34d218",
-                "reference": "d3ad0aa3b9f934602cb3e3902ebccf10be34d218",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=8.0 <8.4"
-            },
-            "conflict": {
-                "nette/finder": "<3",
-                "nette/schema": "<1.2.2"
-            },
-            "require-dev": {
-                "jetbrains/phpstorm-attributes": "dev-master",
-                "nette/tester": "^2.5",
-                "phpstan/phpstan": "^1.0",
-                "tracy/tracy": "^2.9"
-            },
-            "suggest": {
-                "ext-gd": "to use Image",
-                "ext-iconv": "to use Strings::webalize(), toAscii(), chr() and reverse()",
-                "ext-intl": "to use Strings::webalize(), toAscii(), normalize() and compare()",
-                "ext-json": "to use Nette\\Utils\\Json",
-                "ext-mbstring": "to use Strings::lower() etc...",
-                "ext-tokenizer": "to use Nette\\Utils\\Reflection::getUseStatements()"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "4.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause",
-                "GPL-2.0-only",
-                "GPL-3.0-only"
-            ],
-            "authors": [
-                {
-                    "name": "David Grudl",
-                    "homepage": "https://davidgrudl.com"
-                },
-                {
-                    "name": "Nette Community",
-                    "homepage": "https://nette.org/contributors"
-                }
-            ],
-            "description": "🛠  Nette Utils: lightweight utilities for string & array manipulation, image handling, safe JSON encoding/decoding, validation, slug or strong password generating etc.",
-            "homepage": "https://nette.org",
-            "keywords": [
-                "array",
-                "core",
-                "datetime",
-                "images",
-                "json",
-                "nette",
-                "paginator",
-                "password",
-                "slugify",
-                "string",
-                "unicode",
-                "utf-8",
-                "utility",
-                "validation"
-            ],
-            "support": {
-                "issues": "https://github.com/nette/utils/issues",
-                "source": "https://github.com/nette/utils/tree/v4.0.4"
-            },
-            "time": "2024-01-17T16:50:36+00:00"
-        },
-        {
-            "name": "php-http/client-common",
-            "version": "2.7.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-http/client-common.git",
-                "reference": "1e19c059b0e4d5f717bf5d524d616165aeab0612"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/php-http/client-common/zipball/1e19c059b0e4d5f717bf5d524d616165aeab0612",
-                "reference": "1e19c059b0e4d5f717bf5d524d616165aeab0612",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.1 || ^8.0",
-                "php-http/httplug": "^2.0",
-                "php-http/message": "^1.6",
-                "psr/http-client": "^1.0",
-                "psr/http-factory": "^1.0",
-                "psr/http-message": "^1.0 || ^2.0",
-                "symfony/options-resolver": "~4.0.15 || ~4.1.9 || ^4.2.1 || ^5.0 || ^6.0 || ^7.0",
-                "symfony/polyfill-php80": "^1.17"
-            },
-            "require-dev": {
-                "doctrine/instantiator": "^1.1",
-                "guzzlehttp/psr7": "^1.4",
-                "nyholm/psr7": "^1.2",
-                "phpspec/phpspec": "^5.1 || ^6.3 || ^7.1",
-                "phpspec/prophecy": "^1.10.2",
-                "phpunit/phpunit": "^7.5.20 || ^8.5.33 || ^9.6.7"
-            },
-            "suggest": {
-                "ext-json": "To detect JSON responses with the ContentTypePlugin",
-                "ext-libxml": "To detect XML responses with the ContentTypePlugin",
-                "php-http/cache-plugin": "PSR-6 Cache plugin",
-                "php-http/logger-plugin": "PSR-3 Logger plugin",
-                "php-http/stopwatch-plugin": "Symfony Stopwatch plugin"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "Http\\Client\\Common\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Márk Sági-Kazár",
-                    "email": "mark.sagikazar@gmail.com"
-                }
-            ],
-            "description": "Common HTTP Client implementations and tools for HTTPlug",
-            "homepage": "http://httplug.io",
-            "keywords": [
-                "client",
-                "common",
-                "http",
-                "httplug"
-            ],
-            "support": {
-                "issues": "https://github.com/php-http/client-common/issues",
-                "source": "https://github.com/php-http/client-common/tree/2.7.1"
-            },
-            "time": "2023-11-30T10:31:25+00:00"
-        },
-        {
-            "name": "php-http/httplug",
-            "version": "2.4.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-http/httplug.git",
-                "reference": "625ad742c360c8ac580fcc647a1541d29e257f67"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/php-http/httplug/zipball/625ad742c360c8ac580fcc647a1541d29e257f67",
-                "reference": "625ad742c360c8ac580fcc647a1541d29e257f67",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.1 || ^8.0",
-                "php-http/promise": "^1.1",
-                "psr/http-client": "^1.0",
-                "psr/http-message": "^1.0 || ^2.0"
-            },
-            "require-dev": {
-                "friends-of-phpspec/phpspec-code-coverage": "^4.1 || ^5.0 || ^6.0",
-                "phpspec/phpspec": "^5.1 || ^6.0 || ^7.0"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "Http\\Client\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Eric GELOEN",
-                    "email": "geloen.eric@gmail.com"
-                },
-                {
-                    "name": "Márk Sági-Kazár",
-                    "email": "mark.sagikazar@gmail.com",
-                    "homepage": "https://sagikazarmark.hu"
-                }
-            ],
-            "description": "HTTPlug, the HTTP client abstraction for PHP",
-            "homepage": "http://httplug.io",
-            "keywords": [
-                "client",
-                "http"
-            ],
-            "support": {
-                "issues": "https://github.com/php-http/httplug/issues",
-                "source": "https://github.com/php-http/httplug/tree/2.4.0"
-            },
-            "time": "2023-04-14T15:10:03+00:00"
-        },
-        {
-            "name": "php-http/message",
-            "version": "1.16.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-http/message.git",
-                "reference": "5997f3289332c699fa2545c427826272498a2088"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/php-http/message/zipball/5997f3289332c699fa2545c427826272498a2088",
-                "reference": "5997f3289332c699fa2545c427826272498a2088",
-                "shasum": ""
-            },
-            "require": {
-                "clue/stream-filter": "^1.5",
-                "php": "^7.2 || ^8.0",
-                "psr/http-message": "^1.1 || ^2.0"
-            },
-            "provide": {
-                "php-http/message-factory-implementation": "1.0"
-            },
-            "require-dev": {
-                "ergebnis/composer-normalize": "^2.6",
-                "ext-zlib": "*",
-                "guzzlehttp/psr7": "^1.0 || ^2.0",
-                "laminas/laminas-diactoros": "^2.0 || ^3.0",
-                "php-http/message-factory": "^1.0.2",
-                "phpspec/phpspec": "^5.1 || ^6.3 || ^7.1",
-                "slim/slim": "^3.0"
-            },
-            "suggest": {
-                "ext-zlib": "Used with compressor/decompressor streams",
-                "guzzlehttp/psr7": "Used with Guzzle PSR-7 Factories",
-                "laminas/laminas-diactoros": "Used with Diactoros Factories",
-                "slim/slim": "Used with Slim Framework PSR-7 implementation"
-            },
-            "type": "library",
-            "autoload": {
-                "files": [
-                    "src/filters.php"
-                ],
-                "psr-4": {
-                    "Http\\Message\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Márk Sági-Kazár",
-                    "email": "mark.sagikazar@gmail.com"
-                }
-            ],
-            "description": "HTTP Message related tools",
-            "homepage": "http://php-http.org",
-            "keywords": [
-                "http",
-                "message",
-                "psr-7"
-            ],
-            "support": {
-                "issues": "https://github.com/php-http/message/issues",
-                "source": "https://github.com/php-http/message/tree/1.16.1"
-            },
-            "time": "2024-03-07T13:22:09+00:00"
-        },
-        {
-            "name": "php-http/promise",
-            "version": "1.3.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-http/promise.git",
-                "reference": "fc85b1fba37c169a69a07ef0d5a8075770cc1f83"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/php-http/promise/zipball/fc85b1fba37c169a69a07ef0d5a8075770cc1f83",
-                "reference": "fc85b1fba37c169a69a07ef0d5a8075770cc1f83",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.1 || ^8.0"
-            },
-            "require-dev": {
-                "friends-of-phpspec/phpspec-code-coverage": "^4.3.2 || ^6.3",
-                "phpspec/phpspec": "^5.1.2 || ^6.2 || ^7.4"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "Http\\Promise\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Joel Wurtz",
-                    "email": "joel.wurtz@gmail.com"
-                },
-                {
-                    "name": "Márk Sági-Kazár",
-                    "email": "mark.sagikazar@gmail.com"
-                }
-            ],
-            "description": "Promise used for asynchronous HTTP requests",
-            "homepage": "http://httplug.io",
-            "keywords": [
-                "promise"
-            ],
-            "support": {
-                "issues": "https://github.com/php-http/promise/issues",
-                "source": "https://github.com/php-http/promise/tree/1.3.1"
-            },
-            "time": "2024-03-15T13:55:21+00:00"
-        },
-        {
-            "name": "psr/http-client",
-            "version": "1.0.3",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-fig/http-client.git",
-                "reference": "bb5906edc1c324c9a05aa0873d40117941e5fa90"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/http-client/zipball/bb5906edc1c324c9a05aa0873d40117941e5fa90",
-                "reference": "bb5906edc1c324c9a05aa0873d40117941e5fa90",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.0 || ^8.0",
-                "psr/http-message": "^1.0 || ^2.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Psr\\Http\\Client\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
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diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
new file mode 100644
index 0000000..aab4991
--- /dev/null
+++ b/phpstan-baseline.neon
@@ -0,0 +1,2 @@
+parameters:
+	ignoreErrors: []
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 6e451fa..b9ca222 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -1,4 +1,7 @@
 parameters:
-    level: 6
+    level: 8
     paths:
         - src
+
+includes:
+    - phpstan-baseline.neon
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..0c12bb9
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.3/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+>
+    <testsuites>
+        <testsuite name="Test Suite">
+            <directory suffix="Test.php">./tests</directory>
+        </testsuite>
+    </testsuites>
+    <source>
+        <include>
+            <directory suffix=".php">./src</directory>
+        </include>
+    </source>
+</phpunit>
diff --git a/src/Api/AbstractApi.php b/src/Api/AbstractApi.php
index 04ca40c..1f97ba1 100644
--- a/src/Api/AbstractApi.php
+++ b/src/Api/AbstractApi.php
@@ -2,52 +2,64 @@
 
 namespace IPay\Api;
 
+use EventSauce\ObjectHydrator\DefinitionProvider;
+use EventSauce\ObjectHydrator\KeyFormatterWithoutConversion;
+use EventSauce\ObjectHydrator\ObjectMapper;
+use EventSauce\ObjectHydrator\ObjectMapperUsingReflection;
 use IPay\IPayClient;
-use League\ObjectMapper\KeyFormatterWithoutConversion;
-use League\ObjectMapper\ObjectMapper;
-use League\ObjectMapper\ObjectMapperUsingReflection;
-use League\ObjectMapper\ReflectionDefinitionProvider;
 use Nette\Utils\Json;
+use Symfony\Component\OptionsResolver\OptionsResolver;
 
+/**
+ * @template T of SessionInterface
+ */
 abstract class AbstractApi
 {
-    private ObjectMapper $objectMapper;
+    protected ObjectMapper $objectMapper;
 
+    /**
+     * @param T $session
+     */
     public function __construct(
-        protected IPayClient $client,
+        protected IPayClient $iPayClient,
+        private SessionInterface $session,
     ) {
         $this->objectMapper = new ObjectMapperUsingReflection(
-            new ReflectionDefinitionProvider(
+            new DefinitionProvider(
                 keyFormatter: new KeyFormatterWithoutConversion(),
             ),
         );
     }
 
     /**
-     * @param string[] $data
+     * @param string[] $parameters
      *
      * @return mixed[]
      */
-    protected function post(string $uri, array $data = []): array
+    protected function post(string $uri, array $parameters = []): array
     {
-        $response = $this->client->getClient()->post(
-            $uri,
+        $response = $this->iPayClient->getClient()->post(
+            sprintf('ipay/wa/%s', $uri),
             [],
-            $this->configureFieldBuilder(
-                FieldBuilder::with($data)
-            )->encrypt()
+            BodyBuilder::from($parameters)
+                ->enhance($this->getSession()->getRequestParameters())
+                ->build()
+                ->encrypt()
         );
 
         return Json::decode((string) $response->getBody(), true);
     }
 
-    protected function configureFieldBuilder(FieldBuilder $builder): FieldBuilder
+    protected static function createOptionsResolver(): OptionsResolver
     {
-        return $builder->withRequiredFields();
+        return new OptionsResolver();
     }
 
-    public function getObjectMapper(): ObjectMapper
+    /**
+     * @return T
+     */
+    public function getSession(): SessionInterface
     {
-        return $this->objectMapper;
+        return $this->session;
     }
 }
diff --git a/src/Api/Auth.php b/src/Api/Auth.php
deleted file mode 100644
index e6dbcde..0000000
--- a/src/Api/Auth.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-namespace IPay\Api;
-
-final class Auth extends AbstractApi
-{
-    public function login(
-        string $userName,
-        string $accessCode,
-        string $captchaCode,
-        string $captchaId,
-    ): Session {
-        $result = $this->post('/signIn', get_defined_vars());
-
-        return new Session($result['sessionId'], $this->client);
-    }
-}
diff --git a/src/Api/AuthenticatedApi.php b/src/Api/AuthenticatedApi.php
new file mode 100644
index 0000000..6202fad
--- /dev/null
+++ b/src/Api/AuthenticatedApi.php
@@ -0,0 +1,122 @@
+<?php
+
+namespace IPay\Api;
+
+use IPay\Entity\Account;
+use IPay\Entity\Customer;
+use IPay\Entity\Transaction;
+use IPay\IPayClient;
+use Symfony\Component\OptionsResolver\Options;
+use Symfony\Component\VarExporter\LazyGhostTrait;
+
+/**
+ * @extends AbstractApi<AuthenticatedSession>
+ */
+final class AuthenticatedApi extends AbstractApi
+{
+    use LazyGhostTrait;
+
+    public Customer $customer;
+
+    /** @var list<Account> */
+    public array $accounts;
+
+    public function __construct(IPayClient $iPayClient, AuthenticatedSession $session)
+    {
+        parent::__construct($iPayClient, $session);
+        self::createLazyGhost(
+            initializer: $this->populateLazyProperties(...),
+            instance: $this,
+        );
+    }
+
+    private function populateLazyProperties(): void
+    {
+        $this->customer = $this->customer();
+        $this->accounts = $this->accounts();
+    }
+
+    /**
+     * @throws \IPay\Exception\SessionException
+     */
+    private function customer(): Customer
+    {
+        return $this->objectMapper->hydrateObject(
+            Customer::class,
+            $this->post('getCustomerDetails')['customerInfo'],
+        );
+    }
+
+    /**
+     * @return list<Account>
+     *
+     * @throws \IPay\Exception\SessionException
+     */
+    private function accounts(): array
+    {
+        return $this->objectMapper->hydrateObjects(
+            Account::class,
+            $this->post('getEntitiesAndAccounts')['accounts'],
+        )->toArray();
+    }
+
+    /**
+     * @param array{
+     *      accountNumber?: string,
+     *      tranType?: 'Credit'|'Debit'|'',
+     *      startDate?: \DateTimeInterface,
+     *      endDate?: \DateTimeInterface,
+     * } $parameters
+     *
+     * @return \Iterator<int, Transaction>
+     *
+     * @throws \IPay\Exception\SessionException
+     */
+    public function historyTransactions(array $parameters): \Iterator
+    {
+        $datetimeNormalizer = static function (
+            Options $resolver,
+            \DateTimeInterface $value
+        ): string {
+            return $value->format('Y-m-d');
+        };
+
+        $resolver = self::createOptionsResolver()
+            ->setRequired([
+                'accountNumber',
+                'tranType',
+                'startDate',
+                'endDate',
+            ])
+            ->setAllowedTypes('accountNumber', 'string')
+            ->setAllowedValues('tranType', ['Credit', 'Debit', ''])
+            ->setAllowedTypes('startDate', \DateTimeInterface::class)
+            ->setAllowedTypes('endDate', \DateTimeInterface::class)
+            ->setNormalizer('startDate', $datetimeNormalizer)
+            ->setNormalizer('endDate', $datetimeNormalizer)
+            ->setDefaults([
+                'accountNumber' => $this->customer->accountNumber,
+                'tranType' => 'Credit',
+                'startDate' => new \DateTimeImmutable(),
+                'endDate' => new \DateTimeImmutable(),
+            ])
+        ;
+
+        $parameters = $resolver->resolve($parameters);
+
+        $parameters['pageNumber'] = 0;
+        do {
+            $transactions = $this->post(
+                'getHistTransactions',
+                $parameters
+            )['transactions'];
+            foreach ($this->objectMapper->hydrateObjects(
+                Transaction::class,
+                $transactions
+            )->getIterator() as $transaction) {
+                yield $transaction;
+            }
+            ++$parameters['pageNumber'];
+        } while (count($transactions) > 0);
+    }
+}
diff --git a/src/Api/AuthenticatedSession.php b/src/Api/AuthenticatedSession.php
new file mode 100644
index 0000000..edd8640
--- /dev/null
+++ b/src/Api/AuthenticatedSession.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace IPay\Api;
+
+final class AuthenticatedSession extends UnauthenticatedSession
+{
+    public function __construct(public string $id)
+    {
+    }
+
+    public function getRequestParameters(): array
+    {
+        return ['sessionId' => $this->id, ...parent::getRequestParameters()];
+    }
+}
diff --git a/src/Api/FieldBuilder.php b/src/Api/BodyBuilder.php
similarity index 65%
rename from src/Api/FieldBuilder.php
rename to src/Api/BodyBuilder.php
index f013b4c..42b3db2 100644
--- a/src/Api/FieldBuilder.php
+++ b/src/Api/BodyBuilder.php
@@ -4,12 +4,11 @@
 
 use IPay\Encryption\Encrypter;
 use Nette\Utils\Json;
-use Nette\Utils\Random;
 
 /**
  * @extends \ArrayObject<string,string>
  */
-final class FieldBuilder extends \ArrayObject implements \Stringable, \JsonSerializable
+final class BodyBuilder extends \ArrayObject implements \Stringable, \JsonSerializable
 {
     /**
      * @param string[] $data
@@ -22,17 +21,17 @@ private function __construct(array $data)
     /**
      * @param string[] $data
      */
-    public static function with(array $data): static
+    public static function from(array $data): static
     {
         return new static($data);
     }
 
-    public function withRequiredFields(): self
+    /**
+     * @param string[] $parameters
+     */
+    public function enhance(array $parameters): static
     {
-        $this['lang'] = 'en';
-        $this['requestId'] = Random::generate(12, '0-9A-Z').'|'.time();
-
-        return $this;
+        return static::from($this->getArrayCopy() + $parameters);
     }
 
     public function build(): self
@@ -46,9 +45,7 @@ public function build(): self
 
     public function encrypt(): string
     {
-        return new static([
-            'encrypted' => Encrypter::encrypt($this->build()),
-        ]);
+        return static::from(['encrypted' => Encrypter::encrypt($this)]);
     }
 
     public function __toString(): string
diff --git a/src/Api/Session.php b/src/Api/Session.php
deleted file mode 100644
index e8ed17e..0000000
--- a/src/Api/Session.php
+++ /dev/null
@@ -1,31 +0,0 @@
-<?php
-
-namespace IPay\Api;
-
-use IPay\Entity\Customer;
-use IPay\IPayClient;
-
-final class Session extends AbstractApi
-{
-    public function __construct(
-        private string $id,
-        protected IPayClient $client,
-    ) {
-        parent::__construct($client);
-    }
-
-    public function customer(): Customer
-    {
-        return $this->getObjectMapper()->hydrateObject(
-            Customer::class,
-            $this->post('/getCustomerDetails'),
-        );
-    }
-
-    protected function configureFieldBuilder(FieldBuilder $builder): FieldBuilder
-    {
-        $builder['sessionId'] = $this->id;
-
-        return parent::configureFieldBuilder($builder);
-    }
-}
diff --git a/src/Api/SessionInterface.php b/src/Api/SessionInterface.php
new file mode 100644
index 0000000..bada074
--- /dev/null
+++ b/src/Api/SessionInterface.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace IPay\Api;
+
+interface SessionInterface
+{
+    /**
+     * @return string[]
+     */
+    public function getRequestParameters(): array;
+}
diff --git a/src/Api/UnauthenticatedApi.php b/src/Api/UnauthenticatedApi.php
new file mode 100644
index 0000000..223ff11
--- /dev/null
+++ b/src/Api/UnauthenticatedApi.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace IPay\Api;
+
+use IPay\Captcha\CaptchaSolver;
+use Nette\Utils\Random;
+
+/**
+ * @extends AbstractApi<UnauthenticatedSession>
+ */
+final class UnauthenticatedApi extends AbstractApi
+{
+    /**
+     * @param array{
+     *      userName: string,
+     *      accessCode: string,
+     * } $credentials
+     *
+     * @throws \IPay\Exception\LoginException
+     */
+    public function login(array $credentials): AuthenticatedApi
+    {
+        $resolver = self::createOptionsResolver()
+            ->setRequired([
+                'userName',
+                'accessCode',
+            ])
+            ->setAllowedTypes('userName', 'string')
+            ->setAllowedTypes('accessCode', 'string')
+        ;
+
+        $parameters = $resolver->resolve($credentials) + $this->bypassCaptcha();
+
+        /** @var array{sessionId: string, ...} */
+        $result = $this->post('signIn', $parameters);
+
+        return new AuthenticatedApi(
+            $this->iPayClient,
+            new AuthenticatedSession($result['sessionId'])
+        );
+    }
+
+    /**
+     * @return array{captchaId:string,captchaCode:string}
+     */
+    private function bypassCaptcha(): array
+    {
+        $captchaId = Random::generate(9, '0-9a-zA-Z');
+        $svg = (string) $this->iPayClient->getClient()
+            ->get(sprintf('api/get-captcha/%s', $captchaId))
+            ->getBody();
+        $captchaCode = CaptchaSolver::solve($svg);
+
+        return compact('captchaId', 'captchaCode');
+    }
+}
diff --git a/src/Api/UnauthenticatedSession.php b/src/Api/UnauthenticatedSession.php
new file mode 100644
index 0000000..d6b5bd9
--- /dev/null
+++ b/src/Api/UnauthenticatedSession.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace IPay\Api;
+
+use Nette\Utils\Random;
+
+class UnauthenticatedSession implements SessionInterface
+{
+    public function getRequestParameters(): array
+    {
+        return [
+            'lang' => 'en',
+            'requestId' => Random::generate(12, '0-9A-Z').'|'.time(),
+        ];
+    }
+}
diff --git a/src/Captcha/CaptchaSolver.php b/src/Captcha/CaptchaSolver.php
new file mode 100644
index 0000000..2370241
--- /dev/null
+++ b/src/Captcha/CaptchaSolver.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace IPay\Captcha;
+
+use Symfony\Component\DomCrawler\Crawler;
+
+final class CaptchaSolver
+{
+    private const LENGTH_TO_NUMBER_MAPPING = [
+        66 => 0,
+        49 => 1,
+        53 => 2,
+        70 => 3,
+        76 => 4,
+        58 => 5,
+        64 => 6,
+        50 => 7,
+        75 => 8,
+        69 => 9,
+    ];
+
+    public static function solve(string $svg): string
+    {
+        /** @var string[] */
+        $svgPathCommands = (new Crawler($svg))
+            ->filterXPath('//path[@fill!="none"]')
+            ->each(function (Crawler $node): string {
+                return (string) $node->attr('d');
+            });
+
+        sort($svgPathCommands, SORT_NATURAL);
+
+        $result = '';
+        foreach ($svgPathCommands as $svgPathCommand) {
+            /** @var string */
+            $symbolicPath = preg_replace('/[^A-Z]/', '', $svgPathCommand);
+            $result .= static::LENGTH_TO_NUMBER_MAPPING[strlen($symbolicPath)];
+        }
+
+        return $result;
+    }
+}
diff --git a/src/Encryption/Encrypter.php b/src/Encryption/Encrypter.php
index da4d9db..c20a8f1 100644
--- a/src/Encryption/Encrypter.php
+++ b/src/Encryption/Encrypter.php
@@ -2,38 +2,24 @@
 
 namespace IPay\Encryption;
 
-const IPAY_PUBLIC_KEY = <<<PUB
+use phpseclib\Crypt\RSA;
+
+final class Encrypter
+{
+    private const IPAY_PUBLIC_KEY = <<<PUBLIC
 -----BEGIN PUBLIC KEY-----
 MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDLenQHmHpaqYX4IrRVM8H1uB21
 xWuY+clsvn79pMUYR2KwIEfeHcnZFFshjDs3D2ae4KprjkOFZPYzEWzakg2nOIUV
 WO+Q6RlAU1+1fxgTvEXi4z7yi+n0Zs0puOycrm8i67jsQfHi+HgdMxCaKzHvbECr
 +JWnLxnEl6615hEeMQIDAQAB
 -----END PUBLIC KEY-----
-PUB;
+PUBLIC;
 
-class Encrypter
-{
     public static function encrypt(string $message): string
     {
-        $mlen = strlen($message);
-
-        $result = '';
-        foreach (
-            str_split(
-                $message,
-                (int) ceil($mlen / ceil($mlen / 86))
-            ) as $part
-        ) {
-            openssl_public_encrypt(
-                $part,
-                $part,
-                IPAY_PUBLIC_KEY,
-                OPENSSL_PKCS1_OAEP_PADDING
-            );
-
-            $result .= $part;
-        }
+        $rsa = new RSA();
+        $rsa->loadKey(static::IPAY_PUBLIC_KEY);
 
-        return base64_encode($result);
+        return base64_encode($rsa->encrypt($message));
     }
 }
diff --git a/src/Entity/Account.php b/src/Entity/Account.php
new file mode 100644
index 0000000..a2153a3
--- /dev/null
+++ b/src/Entity/Account.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace IPay\Entity;
+
+readonly class AccountState
+{
+    public function __construct(
+        public int $availableBalance,
+        public int $balance,
+    ) {
+    }
+}
+
+readonly class Account
+{
+    public function __construct(
+        public string $title,
+        public string $number,
+        public string $currencyCode,
+        public AccountState $accountState,
+    ) {
+    }
+}
diff --git a/src/Entity/Customer.php b/src/Entity/Customer.php
index 78ef80e..52ef8dd 100644
--- a/src/Entity/Customer.php
+++ b/src/Entity/Customer.php
@@ -2,7 +2,7 @@
 
 namespace IPay\Entity;
 
-use League\ObjectMapper\MapFrom;
+use EventSauce\ObjectHydrator\MapFrom;
 
 #[MapFrom([
     'fullname' => 'name',
@@ -10,29 +10,13 @@
     'jobTitle' => 'job',
     'feeAcctNo' => 'accountNumber',
 ])]
-readonly class Info
+readonly class Customer
 {
-    /**
-     * @internal
-     */
     public function __construct(
         public string $name,
         public string $phone,
         public string $job,
-        public string $accountNumber
-    ) {
-    }
-}
-
-readonly class Customer
-{
-    /**
-     * @internal
-     */
-    public function __construct(
-        public string $userName,
-        #[MapFrom('customerInfo')]
-        public Info $info,
+        public string $accountNumber,
     ) {
     }
 }
diff --git a/src/Entity/Transaction.php b/src/Entity/Transaction.php
new file mode 100644
index 0000000..4e9d0d5
--- /dev/null
+++ b/src/Entity/Transaction.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace IPay\Entity;
+
+use EventSauce\ObjectHydrator\PropertyCasters\CastToDateTimeImmutable;
+use EventSauce\ObjectHydrator\PropertyCasters\CastToType;
+
+readonly class Transaction
+{
+    public function __construct(
+        public string $currency,
+        #[CastToType('integer')]
+        public int $amount,
+        public string $remark,
+        public string $corresponsiveAccount,
+        public string $corresponsiveName,
+        #[CastToDateTimeImmutable('d-m-Y H:i:s')]
+        public \DateTimeImmutable $processDate,
+    ) {
+    }
+}
diff --git a/src/Exception/LoginException.php b/src/Exception/LoginException.php
new file mode 100644
index 0000000..08bc614
--- /dev/null
+++ b/src/Exception/LoginException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace IPay\Exception;
+
+class LoginException extends \Exception
+{
+}
diff --git a/src/Exception/LoginFailedException.php b/src/Exception/LoginFailedException.php
deleted file mode 100644
index 26f8737..0000000
--- a/src/Exception/LoginFailedException.php
+++ /dev/null
@@ -1,7 +0,0 @@
-<?php
-
-namespace IPay\Exception;
-
-class LoginFailedException extends \ErrorException
-{
-}
diff --git a/src/Exception/SessionException.php b/src/Exception/SessionException.php
new file mode 100644
index 0000000..d5c97f2
--- /dev/null
+++ b/src/Exception/SessionException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace IPay\Exception;
+
+class SessionException extends \Exception
+{
+}
diff --git a/src/Exception/SessionExpiredException.php b/src/Exception/SessionExpiredException.php
deleted file mode 100644
index a501da4..0000000
--- a/src/Exception/SessionExpiredException.php
+++ /dev/null
@@ -1,7 +0,0 @@
-<?php
-
-namespace IPay\Exception;
-
-class SessionExpiredException extends \Exception
-{
-}
diff --git a/src/Http/Plugin/ExceptionThrower.php b/src/Http/Plugin/ExceptionThrower.php
index 5d89244..a60305b 100644
--- a/src/Http/Plugin/ExceptionThrower.php
+++ b/src/Http/Plugin/ExceptionThrower.php
@@ -4,7 +4,8 @@
 
 use Http\Client\Common\Plugin;
 use Http\Promise\Promise;
-use IPay\Exception\SessionExpiredException;
+use IPay\Exception\LoginException;
+use IPay\Exception\SessionException;
 use Nette\Utils\Json;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
@@ -15,21 +16,27 @@ public function handleRequest(RequestInterface $request, callable $next, callabl
     {
         return $next($request)->then(function (ResponseInterface $response): ResponseInterface {
             if (200 !== $response->getStatusCode()) {
-                /** @var object{errorCode:string} */
                 $error = Json::decode((string) $response->getBody());
 
-                throw self::createException($error->errorCode);
+                throw self::createException($error);
             }
 
             return $response;
         });
     }
 
-    private static function createException(string $code): \Throwable
+    /**
+     * @param \stdClass&object{errorCode: string, errorMessage?: string} $error
+     */
+    private static function createException(\stdClass $error): \Throwable
     {
-        return match ($code) {
-            '96', '99' => new SessionExpiredException('The session has expired.'),
-            default => new \RuntimeException('Unknown error.'),
+        /** @var class-string<\Exception> */
+        $class = match ($error->errorCode) {
+            'LOGON_CREDENTIALS_REJECTED' => LoginException::class,
+            '96', '99' => SessionException::class,
+            default => \RuntimeException::class,
         };
+
+        return new $class($error->errorMessage ?? 'Unknown error.');
     }
 }
diff --git a/src/IPayClient.php b/src/IPayClient.php
index 960a79d..e1bdf9f 100644
--- a/src/IPayClient.php
+++ b/src/IPayClient.php
@@ -9,7 +9,10 @@
 use Http\Client\Common\PluginClient;
 use Http\Discovery\Psr17FactoryDiscovery;
 use Http\Discovery\Psr18ClientDiscovery;
-use IPay\Api\Auth;
+use IPay\Api\AuthenticatedApi;
+use IPay\Api\AuthenticatedSession;
+use IPay\Api\UnauthenticatedApi;
+use IPay\Api\UnauthenticatedSession;
 use IPay\Http\Plugin\ExceptionThrower;
 
 final class IPayClient
@@ -20,7 +23,7 @@ public static function create(): static
             new HttpMethodsClient(
                 new PluginClient(Psr18ClientDiscovery::find(), [
                     new BaseUriPlugin(Psr17FactoryDiscovery::findUriFactory()
-                        ->createUri('https://api-ipay.vietinbank.vn/ipay/wa')
+                        ->createUri('https://api-ipay.vietinbank.vn')
                     ),
                     new ContentTypePlugin(),
                     new ExceptionThrower(),
@@ -41,8 +44,13 @@ public function getClient(): HttpMethodsClientInterface
         return $this->client;
     }
 
-    public function auth(): Auth
+    public function guest(): UnauthenticatedApi
     {
-        return new Auth($this);
+        return new UnauthenticatedApi($this, new UnauthenticatedSession());
+    }
+
+    public function session(string $id): AuthenticatedApi
+    {
+        return new AuthenticatedApi($this, new AuthenticatedSession($id));
     }
 }
diff --git a/src/functions.php b/src/functions.php
new file mode 100644
index 0000000..844e2b7
--- /dev/null
+++ b/src/functions.php
@@ -0,0 +1,10 @@
+<?php
+
+use IPay\IPayClient;
+
+if (!function_exists('ipay')) {
+    function ipay(): IPayClient
+    {
+        return IPayClient::create();
+    }
+}
diff --git a/tests/Feature/CaptchaTest.php b/tests/Feature/CaptchaTest.php
new file mode 100644
index 0000000..5a9d988
--- /dev/null
+++ b/tests/Feature/CaptchaTest.php
@@ -0,0 +1,11 @@
+<?php
+use IPay\Captcha\CaptchaSolver;
+
+test('captcha solver', function (string $filename, string $result) {
+    $svg = file_get_contents($filename);
+    expect(CaptchaSolver::solve($svg))->toBe($result);
+})->with([
+    'captcha 1' => [__DIR__.'/Fixture/1.svg', '540701'],
+    'captcha 2' => [__DIR__.'/Fixture/2.svg', '826778'],
+    'captcha 3' => [__DIR__.'/Fixture/3.svg', '835697'],
+]);
diff --git a/tests/Feature/ExampleTest.php b/tests/Feature/ExampleTest.php
new file mode 100644
index 0000000..eba6be3
--- /dev/null
+++ b/tests/Feature/ExampleTest.php
@@ -0,0 +1,3 @@
+<?php
+
+// nothing
diff --git a/tests/Feature/Fixture/1.svg b/tests/Feature/Fixture/1.svg
new file mode 100644
index 0000000..19e52cf
--- /dev/null
+++ b/tests/Feature/Fixture/1.svg
@@ -0,0 +1 @@
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new file mode 100644
index 0000000..d261e9e
--- /dev/null
+++ b/tests/Feature/Fixture/2.svg
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\ No newline at end of file
diff --git a/tests/Feature/Fixture/3.svg b/tests/Feature/Fixture/3.svg
new file mode 100644
index 0000000..80718fd
--- /dev/null
+++ b/tests/Feature/Fixture/3.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/tests/Pest.php b/tests/Pest.php
new file mode 100644
index 0000000..5949c61
--- /dev/null
+++ b/tests/Pest.php
@@ -0,0 +1,45 @@
+<?php
+
+/*
+|--------------------------------------------------------------------------
+| Test Case
+|--------------------------------------------------------------------------
+|
+| The closure you provide to your test functions is always bound to a specific PHPUnit test
+| case class. By default, that class is "PHPUnit\Framework\TestCase". Of course, you may
+| need to change it using the "uses()" function to bind a different classes or traits.
+|
+*/
+
+// uses(Tests\TestCase::class)->in('Feature');
+
+/*
+|--------------------------------------------------------------------------
+| Expectations
+|--------------------------------------------------------------------------
+|
+| When you're writing tests, you often need to check that values meet certain conditions. The
+| "expect()" function gives you access to a set of "expectations" methods that you can use
+| to assert different things. Of course, you may extend the Expectation API at any time.
+|
+*/
+
+expect()->extend('toBeOne', function () {
+    return $this->toBe(1);
+});
+
+/*
+|--------------------------------------------------------------------------
+| Functions
+|--------------------------------------------------------------------------
+|
+| While Pest is very powerful out-of-the-box, you may have some testing code specific to your
+| project that you don't want to repeat in every file. Here you can also expose helpers as
+| global functions to help you to reduce the number of lines of code in your test files.
+|
+*/
+
+function something()
+{
+    // ..
+}
diff --git a/tests/TestCase.php b/tests/TestCase.php
new file mode 100644
index 0000000..cfb05b6
--- /dev/null
+++ b/tests/TestCase.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Tests;
+
+use PHPUnit\Framework\TestCase as BaseTestCase;
+
+abstract class TestCase extends BaseTestCase
+{
+    //
+}
diff --git a/tests/Unit/ExampleTest.php b/tests/Unit/ExampleTest.php
new file mode 100644
index 0000000..eba6be3
--- /dev/null
+++ b/tests/Unit/ExampleTest.php
@@ -0,0 +1,3 @@
+<?php
+
+// nothing