diff --git a/src/Resources/app/administration/src/types/openapi.d.ts b/src/Resources/app/administration/src/types/openapi.d.ts
index fcdcdbb75..c8801a035 100644
--- a/src/Resources/app/administration/src/types/openapi.d.ts
+++ b/src/Resources/app/administration/src/types/openapi.d.ts
@@ -516,22 +516,22 @@ export interface components {
       status: string;
     };
     swag_paypal_v1_merchant_integrations_oauth_integration: {
-      integration_method: string;
-      integration_type: string;
-      status: string;
-      oauth_third_party: components["schemas"]["swag_paypal_v1_merchant_integrations_oauth_integration_oauth_third_party"][];
+      integration_method?: string;
+      integration_type?: string;
+      status?: string;
+      oauth_third_party?: components["schemas"]["swag_paypal_v1_merchant_integrations_oauth_integration_oauth_third_party"][];
     };
     swag_paypal_v1_merchant_integrations_oauth_integration_oauth_third_party: {
-      access_token: string;
-      merchant_client_id: string;
-      partner_client_id: string;
-      refresh_token: string;
+      access_token?: string;
+      merchant_client_id?: string;
+      partner_client_id?: string;
+      refresh_token?: string;
       scopes: string[];
     };
     swag_paypal_v1_merchant_integrations_product: {
       name: string;
-      vetting_status: string;
-      capabilities: string[];
+      vetting_status?: string;
+      capabilities?: string[];
     };
     swag_paypal_v1_oauth_credentials: {
       restId: string;
diff --git a/src/Resources/app/administration/src/types/system-config.ts b/src/Resources/app/administration/src/types/system-config.ts
index 4d05837d1..dd8ff973d 100644
--- a/src/Resources/app/administration/src/types/system-config.ts
+++ b/src/Resources/app/administration/src/types/system-config.ts
@@ -2,6 +2,7 @@ export const LANDING_PAGES = ['LOGIN', 'BILLING', 'NO_PREFERENCE'] as const;
 export const BUTTON_COLORS = ['gold', 'blue', 'black', 'silver', 'white'] as const;
 export const BUTTON_SHAPES = ['rect', 'pill', 'sharp'] as const;
 export const INTENTS = ['CAPTURE', 'AUTHORIZE'] as const;
+export const COUNTRY_OVERRIDES = ['en-AU', 'de-DE', 'es-ES', 'fr-FR', 'en-GB', 'it-IT', 'en-US'] as const;
 
 export declare type SystemConfig = {
     'SwagPayPal.settings.clientId'?: string;
@@ -27,12 +28,12 @@ export declare type SystemConfig = {
     'SwagPayPal.settings.ecsListingEnabled'?: boolean;
     'SwagPayPal.settings.ecsButtonColor'?: typeof BUTTON_COLORS[number];
     'SwagPayPal.settings.ecsButtonShape'?: typeof BUTTON_SHAPES[number];
-    'SwagPayPal.settings.ecsButtonLanguageIso'?: string;
+    'SwagPayPal.settings.ecsButtonLanguageIso'?: string | null;
 
     'SwagPayPal.settings.ecsShowPayLater'?: boolean;
     'SwagPayPal.settings.spbButtonColor'?: typeof BUTTON_COLORS[number];
     'SwagPayPal.settings.spbButtonShape'?: typeof BUTTON_SHAPES[number];
-    'SwagPayPal.settings.spbButtonLanguageIso'?: string;
+    'SwagPayPal.settings.spbButtonLanguageIso'?: string | null;
     'SwagPayPal.settings.acdcForce3DS'?: boolean;
     'SwagPayPal.settings.puiCustomerServiceInstructions'?: string;
     'SwagPayPal.settings.installmentBannerDetailPageEnabled'?: boolean;
@@ -49,7 +50,7 @@ export declare type SystemConfig = {
     /**
      * @deprecated tag:v10.0.0 - Will be removed without replacement.
      */
-    'SwagPayPal.settings.merchantLocation'?: string;
+    'SwagPayPal.settings.merchantLocation'?: 'other' | 'germany';
 
     /**
      * @deprecated tag:v10.0.0 - Will be removed without replacement.
@@ -63,7 +64,7 @@ export declare type SystemConfig = {
     'SwagPayPal.settings.vaultingEnabledVenmo'?: boolean;
 
     'SwagPayPal.settings.crossBorderMessagingEnabled'?: boolean;
-    'SwagPayPal.settings.crossBorderBuyerCountry'?: string;
+    'SwagPayPal.settings.crossBorderBuyerCountry'?: typeof COUNTRY_OVERRIDES[number] | null;
 };
 
 /**
diff --git a/src/RestApi/V1/Api/MerchantIntegrations/OauthIntegration.php b/src/RestApi/V1/Api/MerchantIntegrations/OauthIntegration.php
index 70f530859..3e63c5c6e 100644
--- a/src/RestApi/V1/Api/MerchantIntegrations/OauthIntegration.php
+++ b/src/RestApi/V1/Api/MerchantIntegrations/OauthIntegration.php
@@ -13,7 +13,10 @@
 use Swag\PayPal\RestApi\V1\Api\MerchantIntegrations\OauthIntegration\OauthThirdParty;
 use Swag\PayPal\RestApi\V1\Api\MerchantIntegrations\OauthIntegration\OauthThirdPartyCollection;
 
-#[OA\Schema(schema: 'swag_paypal_v1_merchant_integrations_oauth_integration')]
+#[OA\Schema(
+    schema: 'swag_paypal_v1_merchant_integrations_oauth_integration',
+    required: ['integrationMethod', 'integrationType', 'oauthThirdParty']
+)]
 #[Package('checkout')]
 class OauthIntegration extends PayPalApiStruct
 {
diff --git a/src/RestApi/V1/Api/MerchantIntegrations/OauthIntegration/OauthThirdParty.php b/src/RestApi/V1/Api/MerchantIntegrations/OauthIntegration/OauthThirdParty.php
index 997415291..ce3218415 100644
--- a/src/RestApi/V1/Api/MerchantIntegrations/OauthIntegration/OauthThirdParty.php
+++ b/src/RestApi/V1/Api/MerchantIntegrations/OauthIntegration/OauthThirdParty.php
@@ -11,7 +11,10 @@
 use Shopware\Core\Framework\Log\Package;
 use Swag\PayPal\RestApi\PayPalApiStruct;
 
-#[OA\Schema(schema: 'swag_paypal_v1_merchant_integrations_oauth_integration_oauth_third_party')]
+#[OA\Schema(
+    schema: 'swag_paypal_v1_merchant_integrations_oauth_integration_oauth_third_party',
+    required: ['merchantClientId', 'partnerClientId', 'scopes']
+)]
 #[Package('checkout')]
 class OauthThirdParty extends PayPalApiStruct
 {
diff --git a/src/RestApi/V1/Api/MerchantIntegrations/Product.php b/src/RestApi/V1/Api/MerchantIntegrations/Product.php
index f8f434338..a934b3b76 100644
--- a/src/RestApi/V1/Api/MerchantIntegrations/Product.php
+++ b/src/RestApi/V1/Api/MerchantIntegrations/Product.php
@@ -11,7 +11,10 @@
 use Shopware\Core\Framework\Log\Package;
 use Swag\PayPal\RestApi\PayPalApiStruct;
 
-#[OA\Schema(schema: 'swag_paypal_v1_merchant_integrations_product')]
+#[OA\Schema(
+    schema: 'swag_paypal_v1_merchant_integrations_product',
+    required: ['name'],
+)]
 #[Package('checkout')]
 class Product extends PayPalApiStruct
 {