From 5b12559b8aea6fb9cdf060fe8bc7565788e9c6c5 Mon Sep 17 00:00:00 2001
From: bernard-ng <ngandubernard@gmail.com>
Date: Fri, 13 Oct 2023 10:17:03 +0200
Subject: [PATCH] tests: add test cases

---
 .github/workflows/test.yaml |   21 +
 .gitignore                  |    5 +
 Makefile                    |   34 +-
 README.md                   |    5 +-
 composer.json               |    8 +-
 composer.lock               | 1675 ++++++++++++++++++++++++++++++++++-
 phpunit.xml                 |   20 +
 tests/ClientTest.php        |   88 ++
 tests/CredentialTest.php    |   40 +
 tests/EnvironmentTest.php   |   26 +
 tests/PaymentEntryTest.php  |  143 +++
 11 files changed, 2027 insertions(+), 38 deletions(-)
 create mode 100644 .github/workflows/test.yaml
 create mode 100644 phpunit.xml
 create mode 100644 tests/ClientTest.php
 create mode 100644 tests/CredentialTest.php
 create mode 100644 tests/EnvironmentTest.php
 create mode 100644 tests/PaymentEntryTest.php

diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
new file mode 100644
index 0000000..5991226
--- /dev/null
+++ b/.github/workflows/test.yaml
@@ -0,0 +1,21 @@
+name: Lint
+on: [push]
+jobs:
+    lint:
+        name: PHP Lint
+        runs-on: ubuntu-latest
+        steps:
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: 8.2
+
+            - name: Cache Composer dependencies
+              uses: actions/cache@v2
+              with:
+                  path: /tmp/composer-cache
+                  key: ${{ runner.os }}-${{ hashFiles('**/composer.lock') }}
+
+            - uses: actions/checkout@master
+            - name: test
+              run: make test
diff --git a/.gitignore b/.gitignore
index 57872d0..49d08b7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,6 @@
 /vendor/
+.idea
+.phpunit.result.cache
+.phpunit.cache
+.vscode
+index.php
diff --git a/Makefile b/Makefile
index 1691e0e..f6b830c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,40 @@
+.DEFAULT_GOAL := help
+
+# -----------------------------------
+# Variables
+# -----------------------------------
+is_docker := $(shell docker info > /dev/null 2>&1 && echo 1)
+user := $(shell id -u)
+group := $(shell id -g)
+
+ifeq ($(is_docker), 1)
+	php := USER_ID=$(user) GROUP_ID=$(group) docker-compose run --rm --no-deps php
+	composer := $(php) composer
+else
+	php := php
+	composer := composer
+endif
+
+# -----------------------------------
+# Recipes
+# -----------------------------------
 .PHONY: help
 help: ## affiche cet aide
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
 
 .PHONY: lint
 lint: vendor/autoload.php ## affiche les erreurs de formatage de code
-	php vendor/bin/ecs
-	php vendor/bin/phpstan
+	$(php) vendor/bin/ecs
+	$(php) vendor/bin/phpstan
+
+.PHONY: test
+test: vendor/autoload.php ## lance les tests
+	$(php) vendor/bin/phpunit
 
 .PHONY: lint-fix
 lint-fix: vendor/autoload.php ## corrige les erreurs de formatage de code
-	php vendor/bin/ecs --fix
+	$(php) vendor/bin/ecs --fix
 
 vendor/autoload.php: composer.lock # installe les dépendances PHP
-	composer update
-	composer dump-autoload
+	$(composer) update
+	$(composer) dump-autoload
diff --git a/README.md b/README.md
index 20d07f9..d65cceb 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Maxicash PHP
 
 ![Lint](https://github.com/devscast/maxicash/actions/workflows/lint.yaml/badge.svg)
+![Test](https://github.com/devscast/maxicash/actions/workflows/test.yaml/badge.svg)
 [![Latest Stable Version](https://poser.pugx.org/devscast/maxicash/version)](https://packagist.org/packages/devscast/maxicash)
 [![Total Downloads](https://poser.pugx.org/devscast/maxicash/downloads)](https://packagist.org/packages/devscast/maxicash)
 [![License](https://poser.pugx.org/devscast/maxicash/license)](https://packagist.org/packages/devscast/maxicash)
@@ -20,7 +21,7 @@ The MaxiCash Gateway enables the Merchant to Collect Payment into their MaxiCash
 ### Authentication
 * **Step 1**. Download the MaxiCash Mobile App and signup...
 * **Step 2**. Contact us to upgrade your account to a Merchant Account info@maxicashapp.com
-You will receive a Merchant Form to complete in order to provide your business details and preffered Cashout Wallet or Banking Details.
+You will receive a Merchant Form to complete in order to provide your business details and preferred Cash out Wallet or Banking Details.
 * **Step 3**. Once the paperwork is completed, you will be issued with Live and Sandbox Accounts (MerchantID and MerchantPassword)
 
 
@@ -58,7 +59,7 @@ $url = $maxicash->queryStringURLPayment($entry);
 > **Note** : we highly recommand to do a `server side` redirection, this url can be modified and leak your maxicash credentials when displayed to your user in any manner (eg: a link, button or form) ! you can use the `header("Location: $url")` fonction in vanilla PHP or return a `RedirectResponse($url)` in your controller when using Symfony or Laravel frameworks`
 
 ### Donate Button for NGOs
-Once you signup as an NGO Merchant
+Once you sign up as an NGO Merchant
 
 ```php
 $donationUrl = $maxicash->donationUrl()
diff --git a/composer.json b/composer.json
index f7e6536..a8b98c0 100644
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,11 @@
             "Devscast\\Maxicash\\": "src/"
         }
     },
+    "autoload-dev": {
+        "psr-4": {
+            "Devscast\\Maxicash\\Tests\\": "tests/"
+        }
+    },
     "authors": [
         {
             "name": "bernard-ng",
@@ -23,7 +28,8 @@
     "minimum-stability": "stable",
     "require-dev": {
         "phpstan/phpstan": "^1.10",
-        "symplify/easy-coding-standard": "^12.0"
+        "symplify/easy-coding-standard": "^12.0",
+        "phpunit/phpunit": "^10.4"
     },
     "require": {
         "php": ">=8.2",
diff --git a/composer.lock b/composer.lock
index 1c0fc54..eff3078 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "49b8a49d08eefe2845b5859435c0564c",
+    "content-hash": "3df3d7c6251738a7ab0733a4f9865fc5",
     "packages": [
         {
             "name": "webmozart/assert",
@@ -66,6 +66,232 @@
         }
     ],
     "packages-dev": [
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.11.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "7284c22080590fb39f2ffa3e9057f10a4ddd0e0c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/7284c22080590fb39f2ffa3e9057f10a4ddd0e0c",
+                "reference": "7284c22080590fb39f2ffa3e9057f10a4ddd0e0c",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "conflict": {
+                "doctrine/collections": "<1.6.8",
+                "doctrine/common": "<2.13.3 || >=3,<3.2.2"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.6.8",
+                "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ],
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.11.1"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-03-08T13:26:56+00:00"
+        },
+        {
+            "name": "nikic/php-parser",
+            "version": "v4.17.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "a6303e50c90c355c7eeee2c4a8b27fe8dc8fef1d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/a6303e50c90c355c7eeee2c4a8b27fe8dc8fef1d",
+                "reference": "a6303e50c90c355c7eeee2c4a8b27fe8dc8fef1d",
+                "shasum": ""
+            },
+            "require": {
+                "ext-tokenizer": "*",
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^6.5 || ^7.0 || ^8.0 || ^9.0"
+            },
+            "bin": [
+                "bin/php-parse"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.9-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpParser\\": "lib/PhpParser"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Nikita Popov"
+                }
+            ],
+            "description": "A PHP parser written in PHP",
+            "keywords": [
+                "parser",
+                "php"
+            ],
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.17.1"
+            },
+            "time": "2023-08-13T19:53:39+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "2.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/97803eca37d319dfa7826cc2437fc020857acb53",
+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-phar": "*",
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/2.0.3"
+            },
+            "time": "2021-07-20T11:28:43+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.2.1"
+            },
+            "time": "2022-02-21T01:04:05+00:00"
+        },
         {
             "name": "phpstan/phpstan",
             "version": "1.10.38",
@@ -129,62 +355,1449 @@
             "time": "2023-10-06T14:19:14+00:00"
         },
         {
-            "name": "symplify/easy-coding-standard",
-            "version": "12.0.8",
+            "name": "phpunit/php-code-coverage",
+            "version": "10.1.7",
             "source": {
                 "type": "git",
-                "url": "https://github.com/easy-coding-standard/easy-coding-standard.git",
-                "reference": "99d87d188acc712dd6655ee946569f823cfeff69"
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+                "reference": "355324ca4980b8916c18b9db29f3ef484078f26e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/easy-coding-standard/easy-coding-standard/zipball/99d87d188acc712dd6655ee946569f823cfeff69",
-                "reference": "99d87d188acc712dd6655ee946569f823cfeff69",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/355324ca4980b8916c18b9db29f3ef484078f26e",
+                "reference": "355324ca4980b8916c18b9db29f3ef484078f26e",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2"
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "ext-xmlwriter": "*",
+                "nikic/php-parser": "^4.15",
+                "php": ">=8.1",
+                "phpunit/php-file-iterator": "^4.0",
+                "phpunit/php-text-template": "^3.0",
+                "sebastian/code-unit-reverse-lookup": "^3.0",
+                "sebastian/complexity": "^3.0",
+                "sebastian/environment": "^6.0",
+                "sebastian/lines-of-code": "^2.0",
+                "sebastian/version": "^4.0",
+                "theseer/tokenizer": "^1.2.0"
             },
-            "conflict": {
-                "friendsofphp/php-cs-fixer": "<3.0",
-                "squizlabs/php_codesniffer": "<3.6",
-                "symplify/coding-standard": "<11.3"
+            "require-dev": {
+                "phpunit/phpunit": "^10.1"
             },
-            "bin": [
-                "bin/ecs"
+            "suggest": {
+                "ext-pcov": "PHP extension that provides line coverage",
+                "ext-xdebug": "PHP extension that provides line coverage as well as branch and path coverage"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "10.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
             ],
+            "description": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
+            "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
+            "keywords": [
+                "coverage",
+                "testing",
+                "xunit"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
+                "security": "https://github.com/sebastianbergmann/php-code-coverage/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/10.1.7"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-10-04T15:34:17+00:00"
+        },
+        {
+            "name": "phpunit/php-file-iterator",
+            "version": "4.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
+                "reference": "a95037b6d9e608ba092da1b23931e537cadc3c3c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/a95037b6d9e608ba092da1b23931e537cadc3c3c",
+                "reference": "a95037b6d9e608ba092da1b23931e537cadc3c3c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^10.0"
+            },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-dev"
+                }
+            },
             "autoload": {
-                "files": [
-                    "bootstrap.php"
+                "classmap": [
+                    "src/"
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "MIT"
+                "BSD-3-Clause"
             ],
-            "description": "Use Coding Standard with 0-knowledge of PHP-CS-Fixer and PHP_CodeSniffer",
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "FilterIterator implementation that filters files based on a list of suffixes.",
+            "homepage": "https://github.com/sebastianbergmann/php-file-iterator/",
             "keywords": [
-                "Code style",
-                "automation",
-                "fixer",
-                "static analysis"
+                "filesystem",
+                "iterator"
             ],
             "support": {
-                "issues": "https://github.com/easy-coding-standard/easy-coding-standard/issues",
-                "source": "https://github.com/easy-coding-standard/easy-coding-standard/tree/12.0.8"
+                "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
+                "security": "https://github.com/sebastianbergmann/php-file-iterator/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/4.1.0"
             },
             "funding": [
                 {
-                    "url": "https://www.paypal.me/rectorphp",
-                    "type": "custom"
-                },
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-08-31T06:24:48+00:00"
+        },
+        {
+            "name": "phpunit/php-invoker",
+            "version": "4.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-invoker.git",
+                "reference": "f5e568ba02fa5ba0ddd0f618391d5a9ea50b06d7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-invoker/zipball/f5e568ba02fa5ba0ddd0f618391d5a9ea50b06d7",
+                "reference": "f5e568ba02fa5ba0ddd0f618391d5a9ea50b06d7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.1"
+            },
+            "require-dev": {
+                "ext-pcntl": "*",
+                "phpunit/phpunit": "^10.0"
+            },
+            "suggest": {
+                "ext-pcntl": "*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
                 {
-                    "url": "https://github.com/tomasvotruba",
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Invoke callables with a timeout",
+            "homepage": "https://github.com/sebastianbergmann/php-invoker/",
+            "keywords": [
+                "process"
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+                },
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+                    "email": "github@wallbash.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                },
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
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+            "homepage": "https://www.github.com/sebastianbergmann/exporter",
+            "keywords": [
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+                    "type": "github"
+                }
+            ],
+            "time": "2023-09-24T13:22:09+00:00"
+        },
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+            "version": "6.0.1",
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+            },
+            "type": "library",
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+            "autoload": {
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+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "http://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
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+            },
+            "funding": [
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+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-07-19T07:19:23+00:00"
+        },
+        {
+            "name": "sebastian/lines-of-code",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/lines-of-code.git",
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+            },
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+            "type": "library",
+            "extra": {
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+                }
+            },
+            "autoload": {
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+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library for counting the lines of code in PHP source code",
+            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+                "security": "https://github.com/sebastianbergmann/lines-of-code/security/policy",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/2.0.1"
+            },
+            "funding": [
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+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-08-31T09:25:50+00:00"
+        },
+        {
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+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
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+            },
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+            },
+            "require-dev": {
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+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-02-03T07:08:32+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "24ed13d98130f0e7122df55d06c5c4942a577957"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/24ed13d98130f0e7122df55d06c5c4942a577957",
+                "reference": "24ed13d98130f0e7122df55d06c5c4942a577957",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^10.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/3.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-02-03T07:06:18+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "05909fb5bc7df4c52992396d0116aed689f93712"
+            },
+            "dist": {
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+                "shasum": ""
+            },
+            "require": {
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+            },
+            "require-dev": {
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+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "https://github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-02-03T07:05:40+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "4.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "462699a16464c3944eefc02ebdd77882bd3925bf"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/462699a16464c3944eefc02ebdd77882bd3925bf",
+                "reference": "462699a16464c3944eefc02ebdd77882bd3925bf",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^10.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "source": "https://github.com/sebastianbergmann/type/tree/4.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-02-03T07:10:45+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "4.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "c51fa83a5d8f43f1402e3f32a005e6262244ef17"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/c51fa83a5d8f43f1402e3f32a005e6262244ef17",
+                "reference": "c51fa83a5d8f43f1402e3f32a005e6262244ef17",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "source": "https://github.com/sebastianbergmann/version/tree/4.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-02-07T11:34:05+00:00"
+        },
+        {
+            "name": "symplify/easy-coding-standard",
+            "version": "12.0.8",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/easy-coding-standard/easy-coding-standard.git",
+                "reference": "99d87d188acc712dd6655ee946569f823cfeff69"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/easy-coding-standard/easy-coding-standard/zipball/99d87d188acc712dd6655ee946569f823cfeff69",
+                "reference": "99d87d188acc712dd6655ee946569f823cfeff69",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2"
+            },
+            "conflict": {
+                "friendsofphp/php-cs-fixer": "<3.0",
+                "squizlabs/php_codesniffer": "<3.6",
+                "symplify/coding-standard": "<11.3"
+            },
+            "bin": [
+                "bin/ecs"
+            ],
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Use Coding Standard with 0-knowledge of PHP-CS-Fixer and PHP_CodeSniffer",
+            "keywords": [
+                "Code style",
+                "automation",
+                "fixer",
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/easy-coding-standard/easy-coding-standard/issues",
+                "source": "https://github.com/easy-coding-standard/easy-coding-standard/tree/12.0.8"
+            },
+            "funding": [
+                {
+                    "url": "https://www.paypal.me/rectorphp",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/tomasvotruba",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-09-08T10:17:14+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/34a41e998c2183e22995f158c581e7b5e755ab9e",
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-07-28T10:34:58+00:00"
         }
     ],
     "aliases": [],
@@ -192,7 +1805,9 @@
     "stability-flags": [],
     "prefer-stable": false,
     "prefer-lowest": false,
-    "platform": [],
+    "platform": {
+        "php": ">=8.2"
+    },
     "platform-dev": [],
     "plugin-api-version": "2.3.0"
 }
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..a3f1caa
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- https://phpunit.readthedocs.io/en/latest/configuration.html -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.4/phpunit.xsd" backupGlobals="false" colors="true" cacheDirectory=".phpunit.cache">
+  <php>
+    <ini name="display_errors" value="1"/>
+    <ini name="error_reporting" value="-1"/>
+    <server name="SHELL_VERBOSITY" value="-1"/>
+  </php>
+  <testsuites>
+    <testsuite name="Project Test Suite">
+      <directory>tests</directory>
+    </testsuite>
+  </testsuites>
+  <coverage/>
+  <source>
+    <include>
+      <directory suffix=".php">src</directory>
+    </include>
+  </source>
+</phpunit>
diff --git a/tests/ClientTest.php b/tests/ClientTest.php
new file mode 100644
index 0000000..dac43f1
--- /dev/null
+++ b/tests/ClientTest.php
@@ -0,0 +1,88 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Devscast\Maxicash\Tests;
+
+use Devscast\Maxicash\Client;
+use PHPUnit\Framework\TestCase;
+use Devscast\Maxicash\Credential;
+use Devscast\Maxicash\PaymentEntry;
+
+/**
+ * Class ClientTest.
+ *
+ * @author bernard-ng <bernard@devscast.tech>
+ */
+final class ClientTest extends TestCase
+{
+    public function testDonationUrl(): void
+    {
+        $credential = new Credential('merchant_id', 'merchant_key');
+        $client = new Client($credential);
+
+        $this->assertEquals(
+            'https://api-testbed.maxicashapp.com/donationentry?data={MerchantID:"merchant_id",Language:"en"}',
+            $client->donationUrl()
+        );
+
+        $this->assertEquals(
+            'https://api-testbed.maxicashapp.com/donationentry?data={MerchantID:"merchant_id",Language:"fr"}',
+            $client->donationUrl('fr')
+        );
+    }
+
+    public function testFormPostPayment(): void
+    {
+        $credential = new Credential('merchant_id', 'merchant_key');
+        $client = new Client($credential);
+
+        $this->assertEquals(
+            'https://api-testbed.maxicashapp.com/PayEntryPost',
+            $client->formPostPayment()
+        );
+    }
+
+    public function testQueryStringURLPayment(): void
+    {
+        $credential = new Credential('merchant_id', 'merchant_key');
+        $client = new Client($credential);
+
+        $paymentEntry = new PaymentEntry(
+            credential: $credential,
+            amount: 100,
+            reference: 'reference',
+            acceptUrl: 'https://example.com/accept',
+            declineUrl: 'https://example.com/cancel',
+        );
+
+        $exceptedData = '{PayType:"MaxiCash",Amount:"100",Currency:"maxiDollar",Telephone:"",MerchantID:"merchant_id",MerchantPassword:"merchant_key",Language:"en",Reference:"reference",Accepturl:"https://example.com/accept",Cancelurl:"",Declineurl:"https://example.com/cancel",NotifyURL:""}';
+
+        $this->assertEquals(
+            "https://api-testbed.maxicashapp.com/PayEntry?data=$exceptedData",
+            $client->queryStringURLPayment($paymentEntry)
+        );
+    }
+
+    public function testPayEntryWeb(): void
+    {
+        $credential = new Credential('merchant_id', 'merchant_key');
+        $client = new Client($credential);
+
+        $this->assertEquals(
+            'https://api-testbed.maxicashapp.com/Integration/PayEntryWeb',
+            $client->payEntryWeb()
+        );
+    }
+
+    public function testPayEntryWebLog(): void
+    {
+        $credential = new Credential('merchant_id', 'merchant_key');
+        $client = new Client($credential);
+
+        $this->assertEquals(
+            'https://api-testbed.maxicashapp.com/payentryweb?logid=id',
+            $client->payEntryWebLog('id')
+        );
+    }
+}
diff --git a/tests/CredentialTest.php b/tests/CredentialTest.php
new file mode 100644
index 0000000..ec7fd92
--- /dev/null
+++ b/tests/CredentialTest.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Devscast\Maxicash\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Devscast\Maxicash\Credential;
+
+/**
+ * Class CredentialTest.
+ *
+ * @author bernard-ng <bernard@devscast.tech>
+ */
+final class CredentialTest extends TestCase
+{
+    public function testConstructor(): void
+    {
+        $credential = new Credential('merchant_id', 'merchant_key');
+
+        $this->assertEquals('merchant_id', $credential->merchantId);
+        $this->assertEquals('merchant_key', $credential->merchantKey);
+    }
+
+    public function testConstructorEmptyMerchantId(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Merchant ID cannot be empty');
+
+        new Credential('', 'merchant_key');
+    }
+
+    public function testConstructorEmptyMerchantKey(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Merchant Key or password cannot be empty');
+
+        new Credential('merchant_id', '');
+    }
+}
diff --git a/tests/EnvironmentTest.php b/tests/EnvironmentTest.php
new file mode 100644
index 0000000..2ff59e5
--- /dev/null
+++ b/tests/EnvironmentTest.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Devscast\Maxicash\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Devscast\Maxicash\Environment;
+
+/**
+ * Class EnvironmentTest.
+ *
+ * @author bernard-ng <bernard@devscast.tech>
+ */
+final class EnvironmentTest extends TestCase
+{
+    public function testGetBaseUrl(): void
+    {
+        $this->assertEquals(
+            'https://api.maxicashapp.com',
+            Environment::LIVE->getBaseUrl()
+        );
+        $this->assertEquals(
+            'https://api-testbed.maxicashapp.com',
+            Environment::SANDBOX->getBaseUrl()
+        );
+    }
+}
diff --git a/tests/PaymentEntryTest.php b/tests/PaymentEntryTest.php
new file mode 100644
index 0000000..572f571
--- /dev/null
+++ b/tests/PaymentEntryTest.php
@@ -0,0 +1,143 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Devscast\Maxicash\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Devscast\Maxicash\Credential;
+use Devscast\Maxicash\PaymentEntry;
+use Devscast\Maxicash\Data\PayType;
+use Devscast\Maxicash\Data\Currency;
+use Devscast\Maxicash\Data\Language;
+
+/**
+ * Class PaymentEntryTest.
+ *
+ * @author bernard-ng <bernard@devscast.tech>
+ */
+final class PaymentEntryTest extends TestCase
+{
+    public function testConstructorAmountLessThanZero(): void
+    {
+        $credential = new Credential('merchant_id', 'merchant_key');
+
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Amount must be greater than 0');
+
+        new PaymentEntry(
+            credential: $credential,
+            amount: -1,
+            reference: 'reference',
+            acceptUrl: 'https://accept.url',
+            declineUrl: 'https://decline.url'
+        );
+    }
+
+    public function testConstructorEmptyReference(): void
+    {
+        $credential = new Credential('merchant_id', 'merchant_key');
+
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Reference must not be empty');
+
+        new PaymentEntry(
+            credential: $credential,
+            amount: 100,
+            reference: '',
+            acceptUrl: 'https://accept.url',
+            declineUrl: 'https://decline.url'
+        );
+    }
+
+    public function testConstructorEmptyAcceptUrl(): void
+    {
+        $credential = new Credential('merchant_id', 'merchant_key');
+
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Accept url must be a valid url');
+
+        new PaymentEntry(
+            credential: $credential,
+            amount: 100,
+            reference: 'reference',
+            acceptUrl: '',
+            declineUrl: 'https://decline.url'
+        );
+    }
+
+    public function testConstructorEmptyDeclineUrl(): void
+    {
+        $credential = new Credential('merchant_id', 'merchant_key');
+
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Decline url must be a valid url');
+
+        new PaymentEntry(
+            credential: $credential,
+            amount: 100,
+            reference: 'reference',
+            acceptUrl: 'https://accept.url',
+            declineUrl: ''
+        );
+    }
+
+    public function testPost()
+    {
+        $paymentEntry = new PaymentEntry(
+            credential: new Credential('merchantId', 'merchantKey'),
+            amount: 100,
+            reference: 'reference',
+            acceptUrl: 'http://example.com/accept',
+            declineUrl: 'http://example.com/decline',
+            cancelUrl: 'http://example.com/cancel',
+            notifyUrl: 'http://example.com/notify',
+            phone: '1234567890',
+            email: 'test@example.com',
+            payType: PayType::MAXICASH,
+            currency: Currency::DOLLAR,
+            language: Language::EN
+        );
+
+        $expectedResult = [
+            'PayType' => 'MaxiCash',
+            'Amount' => 100,
+            'Currency' => 'maxiDollar',
+            'MerchantPassword' => 'merchantKey',
+            'MerchantID' => 'merchantId',
+            'Language' => 'en',
+            'Telephone' => '1234567890',
+            'Email' => 'test@example.com',
+            'Reference' => 'reference',
+            'accepturl' => 'http://example.com/accept',
+            'declineurl' => 'http://example.com/decline',
+            'cancelurl' => 'http://example.com/cancel',
+            'notifyurl' => 'http://example.com/notify'
+        ];
+
+        $this->assertEquals($expectedResult, $paymentEntry->post());
+    }
+
+    public function testGet()
+    {
+        $paymentEntry = new PaymentEntry(
+            credential: new Credential('merchantId', 'merchantKey'),
+            amount: 100,
+            reference: 'reference',
+            acceptUrl: 'http://example.com/accept',
+            declineUrl: 'http://example.com/decline',
+            cancelUrl: 'http://example.com/cancel',
+            notifyUrl: 'http://example.com/notify',
+            phone: '1234567890',
+            email: 'test@example.com',
+            payType: PayType::MAXICASH,
+            currency: Currency::DOLLAR,
+            language: Language::EN
+        );
+
+        $expectedResult =
+            '{PayType:"MaxiCash",Amount:"100",Currency:"maxiDollar",Telephone:"1234567890",MerchantID:"merchantId",MerchantPassword:"merchantKey",Language:"en",Reference:"reference",Accepturl:"http://example.com/accept",Cancelurl:"http://example.com/cancel",Declineurl:"http://example.com/decline",NotifyURL:"http://example.com/notify"}';
+
+        $this->assertEquals($expectedResult, $paymentEntry->get());
+    }
+}