diff --git a/Controller/ApiController.php b/Controller/ApiController.php
index 3a2cc5f..d065ae6 100755
--- a/Controller/ApiController.php
+++ b/Controller/ApiController.php
@@ -58,7 +58,7 @@ final class ApiController extends Controller
      *
      * @param RequestAbstract  $request  Request
      * @param ResponseAbstract $response Response
-     * @param mixed            $data     Generic data
+     * @param array            $data     Generic data
      *
      * @return void
      *
@@ -66,7 +66,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiTaxCodeCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
+    public function apiTaxCodeCreate(RequestAbstract $request, ResponseAbstract $response, array $data = []) : void
     {
         if (!empty($val = $this->validateTaxCodeCreate($request))) {
             $response->header->status = RequestStatusCode::R_400;
@@ -133,7 +133,7 @@ final class ApiController extends Controller
      *
      * @param RequestAbstract  $request  Request
      * @param ResponseAbstract $response Response
-     * @param mixed            $data     Generic data
+     * @param array            $data     Generic data
      *
      * @return void
      *
@@ -141,7 +141,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiTaxCodeL11nCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
+    public function apiTaxCodeL11nCreate(RequestAbstract $request, ResponseAbstract $response, array $data = []) : void
     {
         if (!empty($val = $this->validateTaxCodeL11nCreate($request))) {
             $response->header->status = RequestStatusCode::R_400;
@@ -181,7 +181,7 @@ final class ApiController extends Controller
      *
      * @param RequestAbstract  $request  Request
      * @param ResponseAbstract $response Response
-     * @param mixed            $data     Generic data
+     * @param array            $data     Generic data
      *
      * @return void
      *
@@ -189,7 +189,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiTaxCodeUpdate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
+    public function apiTaxCodeUpdate(RequestAbstract $request, ResponseAbstract $response, array $data = []) : void
     {
         if (!empty($val = $this->validateTaxCodeUpdate($request))) {
             $response->header->status = RequestStatusCode::R_400;
@@ -254,7 +254,7 @@ final class ApiController extends Controller
      *
      * @param RequestAbstract  $request  Request
      * @param ResponseAbstract $response Response
-     * @param mixed            $data     Generic data
+     * @param array            $data     Generic data
      *
      * @return void
      *
@@ -262,7 +262,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiTaxCodeDelete(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
+    public function apiTaxCodeDelete(RequestAbstract $request, ResponseAbstract $response, array $data = []) : void
     {
         if (!empty($val = $this->validateTaxCodeDelete($request))) {
             $response->header->status = RequestStatusCode::R_400;
@@ -303,7 +303,7 @@ final class ApiController extends Controller
      *
      * @param RequestAbstract  $request  Request
      * @param ResponseAbstract $response Response
-     * @param mixed            $data     Generic data
+     * @param array            $data     Generic data
      *
      * @return void
      *
@@ -311,7 +311,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiTaxCodeL11nUpdate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
+    public function apiTaxCodeL11nUpdate(RequestAbstract $request, ResponseAbstract $response, array $data = []) : void
     {
         if (!empty($val = $this->validateTaxCodeL11nUpdate($request))) {
             $response->header->status = RequestStatusCode::R_400;
@@ -377,7 +377,7 @@ final class ApiController extends Controller
      *
      * @param RequestAbstract  $request  Request
      * @param ResponseAbstract $response Response
-     * @param mixed            $data     Generic data
+     * @param array            $data     Generic data
      *
      * @return void
      *
@@ -385,7 +385,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiTaxCodeL11nDelete(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
+    public function apiTaxCodeL11nDelete(RequestAbstract $request, ResponseAbstract $response, array $data = []) : void
     {
         if (!empty($val = $this->validateTaxCodeL11nDelete($request))) {
             $response->header->status = RequestStatusCode::R_400;
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 7a511a8..4011522 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -36,13 +36,13 @@ final class BackendController extends Controller
      *
      * @param RequestAbstract  $request  Request
      * @param ResponseAbstract $response Response
-     * @param mixed            $data     Generic data
+     * @param array            $data     Generic data
      *
      * @return RenderableInterface Response can be rendered
      *
      * @since 1.0.0
      */
-    public function viewDashboard(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
+    public function viewDashboard(RequestAbstract $request, ResponseAbstract $response, array $data = []) : RenderableInterface
     {
         $head  = $response->data['Content']->head;
         $nonce = $this->app->appSettings->getOption('script-nonce');