diff --git a/.github/workflows/phpstan.yml b/.github/workflows/phpstan.yml
new file mode 100644
index 00000000..f62ce2d7
--- /dev/null
+++ b/.github/workflows/phpstan.yml
@@ -0,0 +1,29 @@
+name: "PHPStan analysis"
+
+on:
+  pull_request:
+  push:
+    branches:
+    - "master"
+
+jobs:
+  phpstan:
+    name: "PHPStan analysis"
+    runs-on: "ubuntu-latest"
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v4"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "pcov"
+          php-version: "${{ matrix.php-version }}"
+          ini-values: memory_limit=-1
+          tools: composer:v2
+
+      - name: "Install dependencies"
+        run: "composer update --no-interaction --no-progress"
+
+      - name: "Run PHPStan"
+        run: "vendor/bin/phpstan"
diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index a306550b..b2245f48 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -17,16 +17,11 @@ jobs:
         dependencies:
           - "highest"
         php-version:
-          - "7.2"
-          - "7.3"
-          - "7.4"
-          - "8.0"
-          - "8.1"
           - "8.2"
           - "8.3"
 
         include:
-          - php-version: '7.2'
+          - php-version: '8.2'
             dependencies: "lowest"
 
     steps:
diff --git a/Makefile b/Makefile
new file mode 100644
index 00000000..24fda018
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,6 @@
+help: ## Show this help.
+	@printf "\033[33mUsage:\033[0m\n  make [target] [arg=\"val\"...]\n\n\033[33mTargets:\033[0m\n"
+	@grep -E '^[-a-zA-Z0-9_\.\/]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[32m%-30s\033[0m %s\n", $$1, $$2}'
+
+static-analysis:
+	@vendor/bin/phpstan analyse
\ No newline at end of file
diff --git a/README.md b/README.md
index 130d776b..c741a97e 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,10 @@
+> [!CAUTION]
+> This is an experimental fork to propose a possible new major version.
+> 
+> It will not be compatible with any existing gateway. Do not try to create a gateway for this version, please 
+> share your [ideas](https://github.com/devnix-labs/omnipay-common/discussions/categories/ideas) so we can elaborate
+> a clear roadmap to define the shape of a new Omnipay version.
+
 # Omnipay Common
 
 **Core components for the Omnipay PHP payment processing library**
diff --git a/composer.json b/composer.json
index be27a33e..c2f24d02 100644
--- a/composer.json
+++ b/composer.json
@@ -28,6 +28,10 @@
         {
             "name": "Del"
         },
+        {
+            "name": "Pablo Largo Mohedano",
+            "email": "devnix.code@gmail.com"
+        },
         {
             "name": "Omnipay Contributors",
             "homepage": "https://github.com/thephpleague/omnipay-common/contributors"
@@ -42,7 +46,7 @@
         "classmap": ["tests/OmnipayTest.php"]
     },
     "require": {
-        "php": "^7.2|^8",
+        "php": "^8.2",
         "php-http/client-implementation": "^1",
         "php-http/message": "^1.5",
         "php-http/message-factory": "^1.1",
@@ -55,7 +59,10 @@
         "php-http/mock-client": "^1.6",
         "php-http/guzzle7-adapter": "^1",
         "squizlabs/php_codesniffer": "^3.8.1",
-        "http-interop/http-factory-guzzle": "^1.1"
+        "http-interop/http-factory-guzzle": "^1.1",
+        "phpstan/phpstan": "^1.12",
+        "phpstan/phpstan-phpunit": "^1.4",
+        "phpunit/phpunit": "^9.6"
     },
     "extra": {
         "branch-alias": {
diff --git a/phpstan.dist.neon b/phpstan.dist.neon
new file mode 100644
index 00000000..e2bb8722
--- /dev/null
+++ b/phpstan.dist.neon
@@ -0,0 +1,8 @@
+includes:
+    - vendor/phpstan/phpstan/conf/bleedingEdge.neon
+    - vendor/phpstan/phpstan-phpunit/extension.neon
+
+parameters:
+    level: 0
+    paths:
+        - src
diff --git a/src/Common/CreditCard.php b/src/Common/CreditCard.php
index c92285ba..07754685 100644
--- a/src/Common/CreditCard.php
+++ b/src/Common/CreditCard.php
@@ -407,16 +407,16 @@ public function getNumberMasked($mask = 'X')
      * Credit Card Brand
      *
      * Iterates through known/supported card brands to determine the brand of this card
-     *
-     * @return string
      */
-    public function getBrand()
+    public function getBrand(): string|null
     {
         foreach ($this->getSupportedBrands() as $brand => $val) {
             if (preg_match($val, $this->getNumber())) {
                 return $brand;
             }
         }
+
+        return null;
     }
 
     /**
diff --git a/src/Common/Message/AbstractRequest.php b/src/Common/Message/AbstractRequest.php
index 004a7757..95ab7fca 100644
--- a/src/Common/Message/AbstractRequest.php
+++ b/src/Common/Message/AbstractRequest.php
@@ -308,9 +308,9 @@ private function getMoney($amount = null)
      * Validates and returns the formatted amount.
      *
      * @throws InvalidRequestException on any validation failure.
-     * @return string The amount formatted to the correct number of decimal places for the selected currency.
+     * @return string|null The amount formatted to the correct number of decimal places for the selected currency.
      */
-    public function getAmount()
+    public function getAmount(): string|null
     {
         $money = $this->getMoney();
 
@@ -319,6 +319,8 @@ public function getAmount()
 
             return $moneyFormatter->format($money);
         }
+
+        return null;
     }
 
     /**
@@ -335,15 +337,17 @@ public function setAmount($value)
     /**
      * Get the payment amount as an integer.
      *
-     * @return integer
+     * @return int|null
      */
-    public function getAmountInteger()
+    public function getAmountInteger(): int|null
     {
         $money = $this->getMoney();
 
         if ($money !== null) {
             return (int) $money->getAmount();
         }
+
+        return null;
     }
 
     /**
diff --git a/tests/Common/AbstractGatewayTest/MockAbstractGateway.php b/tests/Common/AbstractGatewayTest/MockAbstractGateway.php
new file mode 100644
index 00000000..f5b72147
--- /dev/null
+++ b/tests/Common/AbstractGatewayTest/MockAbstractGateway.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Omnipay\Common\AbstractGatewayTest;
+
+final class MockAbstractGateway
+{
+    public function __construct()
+    {
+    }
+}
\ No newline at end of file