diff --git a/composer.json b/composer.json
index 21d97e3..4dd439f 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,11 @@
         "php": ">=8.2"
     },
     "require-dev": {
-        "spryker/code-sniffer": "*"
+        "spryker/code-sniffer": "*",
+        "spryker/symfony": "*"
+    },
+    "suggest": {
+        "spryker/symfony": "You need to install this module when you want to use the Storage Router plugin."
     },
     "autoload": {
         "psr-4": {
diff --git a/src/SprykerShop/Yves/StorageRouterExtension/Dependency/Plugin/StorageRouterEnhancerPluginInterface.php b/src/SprykerShop/Yves/StorageRouterExtension/Dependency/Plugin/StorageRouterEnhancerPluginInterface.php
new file mode 100644
index 0000000..c457d02
--- /dev/null
+++ b/src/SprykerShop/Yves/StorageRouterExtension/Dependency/Plugin/StorageRouterEnhancerPluginInterface.php
@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * Copyright © 2016-present Spryker Systems GmbH. All rights reserved.
+ * Use of this software requires acceptance of the Evaluation License Agreement. See LICENSE file.
+ */
+
+namespace SprykerShop\Yves\StorageRouterExtension\Dependency\Plugin;
+
+use Symfony\Component\Routing\RequestContext;
+
+interface StorageRouterEnhancerPluginInterface
+{
+    /**
+     * Specification:
+     * - Returns a manipulated pathinfo.
+     * - Can be used to e.g. remove optional prefix from pathinfo.
+     *
+     * Symfony's routing component doesn't allow to have optional URL parameter before non-optional ones.
+     *
+     * We need to allow projects to use optional arguments in the URL e.g. `/{store}/{locale}/foo-bar`.
+     * The configured route will only have an URL like `/foo-bar` without the optional arguments but we need to be able
+     * to match an incoming route like `/de/de/foo-bar` to the configured one.
+     *
+     * This method will "normalize" the incoming URL to be matchable.
+     *
+     * @api
+     *
+     * @param string $pathinfo
+     * @param \Symfony\Component\Routing\RequestContext $requestContext
+     *
+     * @return string
+     */
+    public function beforeMatch(string $pathinfo, RequestContext $requestContext): string;
+
+    /**
+     * Specification:
+     * - Adds additional information to the matched $parameters.
+     *
+     * @api
+     *
+     * @param array<mixed> $parameters
+     * @param \Symfony\Component\Routing\RequestContext $requestContext
+     *
+     * @return array<mixed>
+     */
+    public function afterMatch(array $parameters, RequestContext $requestContext): array;
+
+    /**
+     * Specification:
+     * - Returns a manipulated url after it was generated.
+     * - Can be used to e.g. add an optional argument to the URL.
+     *
+     * Symfony's routing component doesn't allow to have optional URL parameter before non-optional ones.
+     *
+     * We need to allow projects to use optional arguments in the URL e.g. `/{store}/{locale}/foo-bar`.
+     * The configured route will only have an URL like `/foo-bar` with a route name e.g. `foo-bar`. After the generator
+     * was able to generate an URL by the given route name we need to add the optional arguments to
+     * return an URL like `/de/de/foo-bar`.
+     *
+     * This method will "normalize" the outgoing URL after it was generated.
+     *
+     * @api
+     *
+     * @param string $url
+     * @param \Symfony\Component\Routing\RequestContext $requestContext
+     * @param int $referenceType
+     *
+     * @return string
+     */
+    public function afterGenerate(string $url, RequestContext $requestContext, int $referenceType): string;
+}