diff --git a/build/ruleset.xml b/build/ruleset.xml
index 19f7b0b..eb0d41b 100644
--- a/build/ruleset.xml
+++ b/build/ruleset.xml
@@ -301,7 +301,6 @@
 	<rule ref="SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly">
 		<properties>
 			<property name="searchAnnotations" value="true"/>
-			<property name="fullyQualifiedKeywords" type="array" value=""/>
 			<property name="allowFallbackGlobalFunctions" value="false"/>
 			<property name="allowFallbackGlobalConstants" value="false"/>
 			<property name="allowFullyQualifiedExceptions" value="false"/>
@@ -378,7 +377,6 @@
 	</rule>
 	<rule ref="SlevomatCodingStandard.TypeHints.ReturnTypeHint">
 		<properties>
-			<property name="enableNativeTypeHint" value="true"/>
 			<property name="enableMixedTypeHint" value="true"/>
 			<property name="enableUnionTypeHint" value="true"/>
 			<property name="traversableTypeHints" type="array" value="
diff --git a/src/Call/ApplePay/InitApplePayRequest.php b/src/Call/ApplePay/InitApplePayRequest.php
index b58f25e..d3e2a61 100644
--- a/src/Call/ApplePay/InitApplePayRequest.php
+++ b/src/Call/ApplePay/InitApplePayRequest.php
@@ -10,6 +10,7 @@
 use SlevomatCsobGateway\Call\InvalidJsonPayloadException;
 use SlevomatCsobGateway\Crypto\SignatureDataFormatter;
 use SlevomatCsobGateway\EncodeHelper;
+use SlevomatCsobGateway\Language;
 use SlevomatCsobGateway\Price;
 use SlevomatCsobGateway\Validator;
 use function array_filter;
@@ -40,6 +41,7 @@ public function __construct(
 		private ?Order $order = null,
 		private ?bool $sdkUsed = null,
 		private ?string $merchantData = null,
+		private ?Language $language = null,
 		private ?int $ttlSec = null,
 	)
 	{
@@ -81,6 +83,7 @@ public function send(ApiClient $apiClient): ActionsPaymentResponse
 			'order' => $this->order?->encode(),
 			'sdkUsed' => $this->sdkUsed,
 			'merchantData' => $this->merchantData !== null ? base64_encode($this->merchantData) : null,
+			'language' => $this->language?->value,
 			'ttlSec' => $this->ttlSec,
 		], EncodeHelper::filterValueCallback());
 
@@ -102,6 +105,7 @@ public function send(ApiClient $apiClient): ActionsPaymentResponse
 				'order' => Order::encodeForSignature(),
 				'sdkUsed' => null,
 				'merchantData' => null,
+				'language' => null,
 				'ttlSec' => null,
 			]),
 			new SignatureDataFormatter(ActionsPaymentResponse::encodeForSignature()),
diff --git a/src/Call/GooglePay/InitGooglePayRequest.php b/src/Call/GooglePay/InitGooglePayRequest.php
index 886a83f..c2629a3 100644
--- a/src/Call/GooglePay/InitGooglePayRequest.php
+++ b/src/Call/GooglePay/InitGooglePayRequest.php
@@ -10,6 +10,7 @@
 use SlevomatCsobGateway\Call\InvalidJsonPayloadException;
 use SlevomatCsobGateway\Crypto\SignatureDataFormatter;
 use SlevomatCsobGateway\EncodeHelper;
+use SlevomatCsobGateway\Language;
 use SlevomatCsobGateway\Price;
 use SlevomatCsobGateway\Validator;
 use function array_filter;
@@ -34,6 +35,7 @@ public function __construct(
 		private ?Order $order = null,
 		private ?bool $sdkUsed = null,
 		private ?string $merchantData = null,
+		private ?Language $language = null,
 		private ?int $ttlSec = null,
 	)
 	{
@@ -70,6 +72,7 @@ public function send(ApiClient $apiClient): ActionsPaymentResponse
 			'order' => $this->order?->encode(),
 			'sdkUsed' => $this->sdkUsed,
 			'merchantData' => $this->merchantData !== null ? base64_encode($this->merchantData) : null,
+			'language' => $this->language?->value,
 			'ttlSec' => $this->ttlSec,
 		], EncodeHelper::filterValueCallback());
 
@@ -91,6 +94,7 @@ public function send(ApiClient $apiClient): ActionsPaymentResponse
 				'order' => Order::encodeForSignature(),
 				'sdkUsed' => null,
 				'merchantData' => null,
+				'language' => null,
 				'ttlSec' => null,
 			]),
 			new SignatureDataFormatter(ActionsPaymentResponse::encodeForSignature()),
diff --git a/src/Call/OneClick/InitOneClickPaymentRequest.php b/src/Call/OneClick/InitOneClickPaymentRequest.php
index 352e9a9..2c24365 100644
--- a/src/Call/OneClick/InitOneClickPaymentRequest.php
+++ b/src/Call/OneClick/InitOneClickPaymentRequest.php
@@ -9,6 +9,7 @@
 use SlevomatCsobGateway\Call\ActionsPaymentResponse;
 use SlevomatCsobGateway\Crypto\SignatureDataFormatter;
 use SlevomatCsobGateway\EncodeHelper;
+use SlevomatCsobGateway\Language;
 use SlevomatCsobGateway\Price;
 use SlevomatCsobGateway\Validator;
 use function array_filter;
@@ -31,6 +32,8 @@ public function __construct(
 		private ?bool $clientInitiated = null,
 		private ?bool $sdkUsed = null,
 		private ?string $merchantData = null,
+		private ?Language $language = null,
+		private ?int $ttlSec = null,
 	)
 	{
 		Validator::checkPayId($this->origPayId);
@@ -59,6 +62,8 @@ public function send(ApiClient $apiClient): ActionsPaymentResponse
 			'clientInitiated' => $this->clientInitiated,
 			'sdkUsed' => $this->sdkUsed,
 			'merchantData' => $this->merchantData !== null ? base64_encode($this->merchantData) : null,
+			'language' => $this->language?->value,
+			'ttlSec' => $this->ttlSec,
 		], EncodeHelper::filterValueCallback());
 
 		$response = $apiClient->post(
@@ -80,6 +85,8 @@ public function send(ApiClient $apiClient): ActionsPaymentResponse
 				'clientInitiated' => null,
 				'sdkUsed' => null,
 				'merchantData' => null,
+				'language' => null,
+				'ttlSec' => null,
 			]),
 			new SignatureDataFormatter(ActionsPaymentResponse::encodeForSignature()),
 		);
diff --git a/src/RequestFactory.php b/src/RequestFactory.php
index 87e3400..2123f8d 100644
--- a/src/RequestFactory.php
+++ b/src/RequestFactory.php
@@ -168,6 +168,8 @@ public function createOneclickInitPayment(
 		?bool $clientInitiated = null,
 		?bool $sdkUsed = null,
 		?string $merchantData = null,
+		?Language $language = null,
+		?int $ttlSec = null,
 	): InitOneClickPaymentRequest
 	{
 		return new InitOneClickPaymentRequest(
@@ -184,6 +186,8 @@ public function createOneclickInitPayment(
 			$clientInitiated,
 			$sdkUsed,
 			$merchantData,
+			$language,
+			$ttlSec,
 		);
 	}
 
@@ -240,6 +244,7 @@ public function createApplePayInitRequest(
 		?\SlevomatCsobGateway\AdditionalData\Order $order = null,
 		?bool $sdkUsed = null,
 		?string $merchantData = null,
+		?Language $language = null,
 		?int $ttlSec = null,
 	): InitApplePayRequest
 	{
@@ -256,6 +261,7 @@ public function createApplePayInitRequest(
 			$order,
 			$sdkUsed,
 			$merchantData,
+			$language,
 			$ttlSec,
 		);
 	}
@@ -368,6 +374,7 @@ public function createGooglePayInitRequest(
 		?\SlevomatCsobGateway\AdditionalData\Order $order = null,
 		?bool $sdkUsed = null,
 		?string $merchantData = null,
+		?Language $language = null,
 		?int $ttlSec = null,
 	): InitGooglePayRequest
 	{
@@ -384,6 +391,7 @@ public function createGooglePayInitRequest(
 			$order,
 			$sdkUsed,
 			$merchantData,
+			$language,
 			$ttlSec,
 		);
 	}