make relying party URL configurable

src/Application/Model/RelyingPartyEntity.php

@@ -26,9 +26,13 @@ class RelyingPartyEntity extends PublicKeyCredentialRpEntity
 {
     public function __construct()
     {
+        $shopUrl = is_string(Registry::getConfig()->getConfigParam('d3webauthn_diffshopurl')) ?
+            trim(Registry::getConfig()->getConfigParam('d3webauthn_diffshopurl')) :
+            null;
+
         parent::__construct(
             Registry::getConfig()->getActiveShop()->getFieldData('oxname'),
-            preg_replace('/(^www\.)(.*)/mi', '$2', $_SERVER['HTTP_HOST'])
+            $shopUrl ?: preg_replace('/(^www\.)(.*)/mi', '$2', $_SERVER['HTTP_HOST'])
         );
     }
 }

src/metadata.php

@@ -146,5 +146,13 @@ $aModule = array(
             'block'         => 'checkout_options_login',
             'file'          => 'Application/views/blocks/page/checkout/inc/checkout_options_login.tpl',
         ]
+    ],
+    'settings'  => [
+        [
+            'group'     => $sModuleId.'_general',
+            'name'      => $sModuleId.'_diffshopurl',
+            'type'      => 'str',
+            'value'     => false
+        ],
     ]
 );