diff --git a/hook/InstallKey.php b/hook/InstallKey.php
new file mode 100644
index 0000000..d252065
--- /dev/null
+++ b/hook/InstallKey.php
@@ -0,0 +1,36 @@
+<?php
+namespace sammo\img_service;
+
+header('Content-Type: application/json');
+
+
+$json_response = [
+    'result'=>false,
+    'reason'=>'Unknown',
+];
+
+$key = $_REQUEST['key']??'';
+
+if (!$key) {
+    $json_response['reason'] = 'no key';
+    die(json_encode($json_response));
+}
+
+if (strlen($key)<16) {
+    $json_response['reason'] = 'key is too short';
+    die(json_encode($json_response));
+}
+
+$keyExists = file_exists(__DIR__.'/HashKey.php');
+if($keyExists){
+    $json_response['reason'] = 'already exists';
+    die(json_encode($json_response));
+}
+
+$keyTemplate = file_get_contents(__DIR__.'/HashKey.orig.php');
+$keyFile = str_replace('=HashKey=', $key, $keyTemplate);
+file_put_contents(__DIR__.'/HashKey.php', $keyFile);
+
+$json_response['result'] = true;
+$json_response['reason'] = 'success';
+die(json_encode($json_response));
\ No newline at end of file