diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..733c330
--- /dev/null
+++ b/TODO.md
@@ -0,0 +1,4 @@
+# TODO
+
+- Remove deceased related entity by form setting.
+- Refactor to PHP8 branch.
diff --git a/src/PrefillGravityForms/Abstracts/GetController.php b/src/PrefillGravityForms/Abstracts/GetController.php
new file mode 100644
index 0000000..8ef44aa
--- /dev/null
+++ b/src/PrefillGravityForms/Abstracts/GetController.php
@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OWC\PrefillGravityForms\Abstracts;
+
+use OWC\PrefillGravityForms\Controllers\BaseController;
+
+abstract class GetController extends BaseController
+{
+    /**
+    * Supplements the '_embedded' array with additional data retrieved via the '_links' array,
+    * using the configured expand arguments to fetch and merge related resources.
+     */
+    protected function supplementEmbeddedByLinks(array $apiResponse, string $embedType = '', string $doelBinding = ''): array
+    {
+        if (! isset($apiResponse['_embedded'][$embedType])) {
+            return $apiResponse;
+        }
+
+        foreach ($apiResponse['_embedded'][$embedType] as $key => $embeddedItem) {
+            if (! isset($embeddedItem['_links']['ingeschrevenPersoon']['href'])) {
+                continue;
+            }
+
+            $response = $this->requestEmbedded(str_replace('https://api.acc-vrijbrp-hoeksche-waard.commonground.nu/haal-centraal-brp-bevragen/api/v1.3/ingeschrevenpersonen', 'https://api.acc-vrijbrp-hoeksche-waard.commonground.nu/api/haalcentraal-brp-bevragen/api/v1.3/ingeschrevenpersonen', $embeddedItem['_links']['ingeschrevenPersoon']['href']), $doelBinding);
+
+            // @todo: do this conditionally based on setting.
+            if (true === ($response['overlijden']['indicatieOverleden'] ?? false)) {
+                unset($apiResponse['_embedded'][$embedType][$key]);
+            }
+        }
+
+        return $apiResponse;
+    }
+
+    abstract protected function requestEmbedded(string $url, string $doelBinding): array;
+}
diff --git a/src/PrefillGravityForms/Abstracts/PostController.php b/src/PrefillGravityForms/Abstracts/PostController.php
new file mode 100644
index 0000000..c7e97f0
--- /dev/null
+++ b/src/PrefillGravityForms/Abstracts/PostController.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OWC\PrefillGravityForms\Abstracts;
+
+use OWC\PrefillGravityForms\Controllers\BaseController;
+
+abstract class PostController extends BaseController
+{
+    /**
+    * Supplements the '_embedded' array with additional data retrieved via the '_links' array,
+    * using the configured expand arguments to fetch and merge related resources.
+     */
+    protected function supplementEmbeddedByLinks(array $apiResponse, string $embedType = ''): array
+    {
+        if (! isset($apiResponse[$embedType])) {
+            return $apiResponse;
+        }
+
+        foreach ($apiResponse[$embedType] as $key => $embeddedItem) {
+            if (! isset($embeddedItem['burgerservicenummer']) || ! is_numeric($embeddedItem['burgerservicenummer'])) {
+                continue;
+            }
+
+            $response = $this->requestEmbedded((string) $embeddedItem['burgerservicenummer']);
+            $personData = $response['personen'] ?? [];
+            $firstPerson = reset($personData); // Response is in a multidimensional array which differs from other suppliers.
+
+            if (! is_array($firstPerson) || 0 === count($firstPerson)) {
+                continue;
+            }
+
+            // @todo: do this conditionally based on setting.
+            if ('overlijden' === ($firstPerson['opschortingBijhouding']['reden']['omschrijving'] ?? '')) {
+                unset($apiResponse[$embedType][$key]);
+            }
+        }
+
+        return $apiResponse;
+    }
+
+    abstract protected function requestEmbedded(string $bsn): array;
+}
diff --git a/src/PrefillGravityForms/Controllers/EnableUController.php b/src/PrefillGravityForms/Controllers/EnableUController.php
index 6c84d9d..1c5a1cf 100644
--- a/src/PrefillGravityForms/Controllers/EnableUController.php
+++ b/src/PrefillGravityForms/Controllers/EnableUController.php
@@ -4,9 +4,10 @@
 
 namespace OWC\PrefillGravityForms\Controllers;
 
+use OWC\PrefillGravityForms\Abstracts\GetController;
 use OWC\PrefillGravityForms\Services\CacheService;
 
-class EnableUController extends BaseController
+class EnableUController extends GetController
 {
     public function handle(array $form): array
     {
@@ -65,6 +66,10 @@ protected function fetchApiResponse(string $bsn, string $doelBinding = '', strin
             return [];
         }
 
+        foreach (array_filter(explode(',', $expand)) as $expandItem) {
+            $apiResponse = $this->supplementEmbeddedByLinks($apiResponse, trim($expandItem), $doelBinding);
+        }
+
         return $apiResponse;
     }
 
@@ -77,4 +82,17 @@ protected function request(string $bsn = '', string $doelBinding = '', string $e
 
         return $this->handleCurl($curlArgs, CacheService::formatTransientKey($bsn));
     }
+
+    protected function requestEmbedded(string $url, string $doelBinding): array
+    {
+        $curlArgs = [
+            CURLOPT_URL => $url,
+            CURLOPT_HTTPHEADER => $this->getCurlHeaders($doelBinding),
+        ];
+
+        $urlParts = explode('/', $url);
+        $bsn = is_array($urlParts) && 0 < count($urlParts) ? end($urlParts) : '';
+
+        return $this->handleCurl($curlArgs, CacheService::formatTransientKey($bsn));
+    }
 }
diff --git a/src/PrefillGravityForms/Controllers/PinkRoccadeController.php b/src/PrefillGravityForms/Controllers/PinkRoccadeController.php
index e56c0c6..73bf12e 100644
--- a/src/PrefillGravityForms/Controllers/PinkRoccadeController.php
+++ b/src/PrefillGravityForms/Controllers/PinkRoccadeController.php
@@ -4,9 +4,10 @@
 
 namespace OWC\PrefillGravityForms\Controllers;
 
+use OWC\PrefillGravityForms\Abstracts\GetController;
 use OWC\PrefillGravityForms\Services\CacheService;
 
-class PinkRoccadeController extends BaseController
+class PinkRoccadeController extends GetController
 {
     public function handle(array $form): array
     {
@@ -65,6 +66,10 @@ protected function fetchApiResponse(string $bsn, string $doelBinding = '', strin
             return [];
         }
 
+        foreach (array_filter(explode(',', $expand)) as $expandItem) {
+            $apiResponse = $this->supplementEmbeddedByLinks($apiResponse, trim($expandItem), $doelBinding);
+        }
+
         return $apiResponse;
     }
 
@@ -79,4 +84,19 @@ protected function request(string $bsn = '', string $doelBinding = '', string $e
 
         return $this->handleCurl($curlArgs, CacheService::formatTransientKey($bsn));
     }
+
+    protected function requestEmbedded(string $url, string $doelBinding): array
+    {
+        $curlArgs = [
+            CURLOPT_URL => $url,
+            CURLOPT_HTTPHEADER => $this->getCurlHeaders($doelBinding),
+            CURLOPT_SSLCERT => $this->settings->getPublicCertificate(),
+            CURLOPT_SSLKEY => $this->settings->getPrivateCertificate(),
+        ];
+
+        $urlParts = explode('/', $url);
+        $bsn = is_array($urlParts) && 0 < count($urlParts) ? end($urlParts) : '';
+
+        return $this->handleCurl($curlArgs, CacheService::formatTransientKey($bsn));
+    }
 }
diff --git a/src/PrefillGravityForms/Controllers/VrijBRPController.php b/src/PrefillGravityForms/Controllers/VrijBRPController.php
index 770cbbe..a824130 100644
--- a/src/PrefillGravityForms/Controllers/VrijBRPController.php
+++ b/src/PrefillGravityForms/Controllers/VrijBRPController.php
@@ -4,9 +4,10 @@
 
 namespace OWC\PrefillGravityForms\Controllers;
 
+use OWC\PrefillGravityForms\Abstracts\GetController;
 use OWC\PrefillGravityForms\Services\CacheService;
 
-class VrijBRPController extends BaseController
+class VrijBRPController extends GetController
 {
     public function handle(array $form): array
     {
@@ -15,6 +16,7 @@ public function handle(array $form): array
         }
 
         $bsn = $this->getBSN();
+        // $bsn = '900231038';
 
         if ('' === $bsn) {
             return $form;
@@ -65,6 +67,10 @@ protected function fetchApiResponse(string $bsn, string $doelBinding = '', strin
             return [];
         }
 
+        foreach (array_filter(explode(',', $expand)) as $expandItem) {
+            $apiResponse = $this->supplementEmbeddedByLinks($apiResponse, trim($expandItem), $doelBinding);
+        }
+
         return $apiResponse;
     }
 
@@ -79,4 +85,19 @@ protected function request(string $bsn = '', string $doelBinding = '', string $e
 
         return $this->handleCurl($curlArgs, CacheService::formatTransientKey($bsn));
     }
+
+    protected function requestEmbedded(string $url, string $doelBinding): array
+    {
+        $curlArgs = [
+            CURLOPT_URL => $url,
+            CURLOPT_HTTPHEADER => $this->getCurlHeaders($doelBinding),
+            CURLOPT_SSLCERT => $this->settings->getPublicCertificate(),
+            CURLOPT_SSLKEY => $this->settings->getPrivateCertificate(),
+        ];
+
+        $urlParts = explode('/', $url);
+        $bsn = is_array($urlParts) && 0 < count($urlParts) ? end($urlParts) : '';
+
+        return $this->handleCurl($curlArgs, CacheService::formatTransientKey($bsn));
+    }
 }
diff --git a/src/PrefillGravityForms/Controllers/WeAreFrankController.php b/src/PrefillGravityForms/Controllers/WeAreFrankController.php
index c9ba2ee..3c90299 100644
--- a/src/PrefillGravityForms/Controllers/WeAreFrankController.php
+++ b/src/PrefillGravityForms/Controllers/WeAreFrankController.php
@@ -5,9 +5,10 @@
 namespace OWC\PrefillGravityForms\Controllers;
 
 use Exception;
+use OWC\PrefillGravityForms\Abstracts\PostController;
 use OWC\PrefillGravityForms\Services\CacheService;
 
-class WeAreFrankController extends BaseController
+class WeAreFrankController extends PostController
 {
     public function handle(array $form): array
     {
@@ -22,9 +23,7 @@ public function handle(array $form): array
         }
 
         $expand = rgar($form, 'owc-iconnect-expand', '');
-        $preparedData = $this->prepareData($bsn, $expand);
-
-        $firstPerson = $this->fetchPersonData($preparedData, $bsn);
+        $firstPerson = $this->fetchPersonData($bsn, $expand);
 
         if (empty($firstPerson)) {
             return $form;
@@ -45,7 +44,7 @@ protected function makeRequest(): array
 
         $preparedData = $this->prepareData($bsn);
 
-        return $this->fetchPersonData($preparedData, $bsn);
+        return $this->fetchPersonData($bsn);
     }
 
     /**
@@ -120,9 +119,9 @@ protected function extractBSN(array $response): string
         return (string) $bsn;
     }
 
-    protected function fetchPersonData(array $preparedData, string $bsn): array
+    protected function fetchPersonData(string $bsn, string $expand = ''): array
     {
-        $apiResponse = $this->request($preparedData, $bsn);
+        $apiResponse = $this->request($bsn, $expand);
         $personData = $apiResponse['personen'] ?? [];
         $firstPerson = reset($personData); // Response is in a multidimensional array which differs from other suppliers.
 
@@ -138,14 +137,36 @@ protected function fetchPersonData(array $preparedData, string $bsn): array
             return [];
         }
 
+        foreach (array_filter(explode(',', $expand)) as $expandItem) {
+            $firstPerson = $this->supplementEmbeddedByLinks($firstPerson, trim($expandItem));
+        }
+
         return $firstPerson;
     }
 
-    protected function request(array $data = [], string $bsn = ''): array
+    protected function request(string $bsn = '', string $expand = ''): array
+    {
+        $curlArgs = [
+            CURLOPT_URL => $this->settings->getBaseURL(),
+            CURLOPT_POSTFIELDS => json_encode($this->prepareData($bsn, $expand)),
+            CURLOPT_HTTPHEADER => [
+                'Content-Type: application/json',
+                'Accept: application/json',
+                sprintf('%s: %s', $this->settings->getAPITokenUsername(), $this->settings->getAPITokenPassword()),
+            ],
+        ];
+
+        return $this->handleCurl($curlArgs, CacheService::formatTransientKey($bsn));
+    }
+
+    /**
+     * This one breaks the contract, fix later.
+     */
+    protected function requestEmbedded(string $bsn = ''): array
     {
         $curlArgs = [
             CURLOPT_URL => $this->settings->getBaseURL(),
-            CURLOPT_POSTFIELDS => json_encode($data),
+            CURLOPT_POSTFIELDS => json_encode($this->prepareData($bsn)),
             CURLOPT_HTTPHEADER => [
                 'Content-Type: application/json',
                 'Accept: application/json',