diff --git a/.github/workflows/run-workflow.yaml b/.github/workflows/run-workflow.yaml
index 94b2bf7..88f1a30 100644
--- a/.github/workflows/run-workflow.yaml
+++ b/.github/workflows/run-workflow.yaml
@@ -14,7 +14,7 @@ jobs:
     continue-on-error: ${{ matrix.experimental }}
     strategy:
       matrix:
-        php-version: ['7.3', '7.4', '8.0', '8.1', '8.2']
+        php-version: ['7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
         experimental: [false]
     steps:
       - uses: actions/checkout@v3
@@ -34,7 +34,7 @@ jobs:
         uses: php-actions/phpstan@v3
         with:
           php_version: ${{ matrix.php-version }}
-          version: 1.9.14
+          version: latest
           configuration: phpstan.neon
           memory_limit: 256M
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e3ac96..ee01a26 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,31 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.7.3] - 2024-07-29
+### Added
+- Support the new VAT in Finland
+
+## [2.7.2] - 2024-06-06
+### Changed
+- Updated validation to support negative item rows
+
+## [2.7.1] - 2024-04-16
+### Added
+- Run tests on PHP 8.3
+### Fixed
+- Fix access to possibly undefined property
+- Validate too long item descriptions on client side
+
+## [2.7.0] - 2024-03-21
+### Added
+- Added customProviders to createPayment() response
+
+## [2.6.0] - 2023-10-12
+### Added
+- Add pay and add card endpoint
+### Fixed
+- Fix payment provider unit test
+
 ## [2.5.2] - 2023-05-05
 ### Fixed
 - Improved refundRequest Validation
diff --git a/README.md b/README.md
index 816d2a8..63e12bf 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,7 @@ List of `Client::class` methods
 | requestSettlements()                | Request settlements                                  |
 | requestPaymentReport()              | Request payment report                               |
 | requestPaymentReportBySettlement()  | Request payment report by settlement ID              |
+| createPaymentAndAddCard()           | Create payment and save card details                 |
 
 
 ---
diff --git a/composer.json b/composer.json
index a07cee6..69c7df6 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,8 @@
     "require": {
         "php": ">=7.3",
         "ext-json": "*",
-        "ext-curl": "*"
+        "ext-curl": "*",
+        "ext-mbstring": "*"
     },
     "require-dev": {
         "phpunit/phpunit": "^10.0 || ^9.0",
diff --git a/src/Client.php b/src/Client.php
index 9a43845..512ab7b 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -38,6 +38,7 @@
 use Paytrail\SDK\Exception\ValidationException;
 use Paytrail\SDK\Exception\RequestException;
 use Paytrail\SDK\Exception\ClientException;
+use Paytrail\SDK\Response\AddCardPaymentResponse;
 
 /**
  * Class Client
@@ -218,7 +219,8 @@ function ($decoded) {
                     ->setTerms($decoded->terms ?? null)
                     ->setGroups($decoded->groups ?? [])
                     ->setReference($decoded->reference ?? null)
-                    ->setProviders($decoded->providers ?? []);
+                    ->setProviders($decoded->providers ?? [])
+                    ->setCustomProviders((array)($decoded->customProviders ?? []));
             }
         );
 
@@ -233,6 +235,7 @@ function ($decoded) {
       * @return PaymentResponse
       * @throws HmacException        Thrown if HMAC calculation fails for responses.
       * @throws ValidationException  Thrown if payment validation fails.
+      * @throws ClientException      Thrown if API call fails.
       */
     public function createShopInShopPayment(ShopInShopPaymentRequest $payment): PaymentResponse
     {
@@ -262,6 +265,23 @@ function ($decoded) {
         return $paymentResponse;
     }
 
+    public function createPaymentAndAddCard(PaymentRequest $paymentRequest): AddCardPaymentResponse
+    {
+        $this->validateRequestItem($paymentRequest);
+
+        $uri = '/tokenization/pay-and-add-card';
+
+        return $this->post(
+            $uri,
+            $paymentRequest,
+            function ($decoded) {
+                return (new AddCardPaymentResponse())
+                    ->setTransactionId($decoded->transactionId ?? null)
+                    ->setRedirectUrl($decoded->redirectUrl ?? null);
+            }
+        );
+    }
+
     /**
      * Create a payment status request.
      *
diff --git a/src/Interfaces/ItemInterface.php b/src/Interfaces/ItemInterface.php
index 25b3a61..1f00fa2 100644
--- a/src/Interfaces/ItemInterface.php
+++ b/src/Interfaces/ItemInterface.php
@@ -59,17 +59,17 @@ public function setUnits(?int $units): ItemInterface;
     /**
      * Get the VAT percentage.
      *
-     * @return int
+     * @return float
      */
-    public function getVatPercentage(): ?int;
+    public function getVatPercentage(): ?float;
 
     /**
      * Set the VAT percentage.
      *
-     * @param int|null $vatPercentage
+     * @param float|null $vatPercentage
      * @return ItemInterface Return self to enable chaining.
      */
-    public function setVatPercentage(?int $vatPercentage): ItemInterface;
+    public function setVatPercentage(?float $vatPercentage): ItemInterface;
 
     /**
      * Get the product code.
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 3847dca..a221f9e 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -43,7 +43,7 @@ class Item implements \JsonSerializable, ItemInterface
     /**
      * The VAT percentage.
      *
-     * @var integer
+     * @var float
      */
     protected $vatPercentage;
 
@@ -159,9 +159,9 @@ public function setUnits(?int $units): ItemInterface
     /**
      * Get the VAT percentage.
      *
-     * @return int
+     * @return float
      */
-    public function getVatPercentage(): ?int
+    public function getVatPercentage(): ?float
     {
         return $this->vatPercentage;
     }
@@ -169,10 +169,10 @@ public function getVatPercentage(): ?int
     /**
      * Set the VAT percentage.
      *
-     * @param int $vatPercentage
+     * @param float $vatPercentage
      * @return ItemInterface Return self to enable chaining.
      */
-    public function setVatPercentage(?int $vatPercentage): ItemInterface
+    public function setVatPercentage(?float $vatPercentage): ItemInterface
     {
         $this->vatPercentage = $vatPercentage;
 
@@ -379,9 +379,6 @@ public function validate()
         if ($props['unitPrice'] === null) {
             throw new ValidationException('Item unitPrice is empty');
         }
-        if ($props['unitPrice'] < 0) {
-            throw new ValidationException('Items unitPrice can\'t be a negative number');
-        }
         if ($props['unitPrice'] > 99999999) {
             throw new ValidationException('Items unitPrice can\'t be over 99999999');
         }
@@ -397,6 +394,9 @@ public function validate()
         if (empty($props['productCode'])) {
             throw new ValidationException('productCode is empty');
         }
+        if ($props['description'] !== null && mb_strlen($props['description']) > 1000) {
+            throw new ValidationException('description does not meet maximum length of 1000');
+        }
 
         return true;
     }
@@ -414,6 +414,10 @@ public function validateShopInShop()
             throw new ValidationException('merchant is empty');
         }
 
+        if ($props['unitPrice'] < 0) {
+            throw new ValidationException('Shop-in-shop item unitPrice can\'t be a negative number');
+        }
+
         return true;
     }
 }
diff --git a/src/Request/ReportBySettlementRequest.php b/src/Request/ReportBySettlementRequest.php
index 3a6645e..702705b 100644
--- a/src/Request/ReportBySettlementRequest.php
+++ b/src/Request/ReportBySettlementRequest.php
@@ -11,7 +11,7 @@ class ReportBySettlementRequest implements \JsonSerializable
     protected $requestType;
     protected $callbackUrl;
     protected $reportFields;
-    protected $subMerchant;
+    protected $submerchant;
 
     public function validate()
     {
@@ -74,12 +74,12 @@ public function setReportFields(array $reportFields): self
     /**
      * Set submerchant.
      *
-     * @param int $subMerchant
+     * @param int $submerchant
      * @return $this
      */
-    public function setSubMerchant(int $subMerchant): self
+    public function setSubMerchant(int $submerchant): self
     {
-        $this->subMerchant = $subMerchant;
+        $this->submerchant = $submerchant;
         return $this;
     }
 
diff --git a/src/Request/ReportRequest.php b/src/Request/ReportRequest.php
index 0a7c216..5cb9f48 100644
--- a/src/Request/ReportRequest.php
+++ b/src/Request/ReportRequest.php
@@ -22,7 +22,7 @@ class ReportRequest implements \JsonSerializable
     private $endDate;
     private $limit;
     private $reportFields;
-    private $subMerchant;
+    private $submerchant;
 
     public function validate()
     {
@@ -164,12 +164,12 @@ public function setReportFields(array $reportFields): self
     /**
      * Set submerchant.
      *
-     * @param int $subMerchant
+     * @param int $submerchant
      * @return $this
      */
-    public function setSubMerchant(int $subMerchant): self
+    public function setSubMerchant(int $submerchant): self
     {
-        $this->subMerchant = $subMerchant;
+        $this->submerchant = $submerchant;
         return $this;
     }
 
diff --git a/src/Request/SettlementRequest.php b/src/Request/SettlementRequest.php
index d9179ac..166883a 100644
--- a/src/Request/SettlementRequest.php
+++ b/src/Request/SettlementRequest.php
@@ -15,7 +15,7 @@ class SettlementRequest implements \JsonSerializable
     protected $endDate;
     protected $reference;
     protected $limit;
-    protected $subMerchant;
+    protected $submerchant;
 
     public function validate()
     {
@@ -102,12 +102,12 @@ public function setLimit(int $limit): self
     /**
      * Set submerchant.
      *
-     * @param int $subMerchant
+     * @param int $submerchant
      * @return $this
      */
-    public function setSubMerchant(int $subMerchant): self
+    public function setSubMerchant(int $submerchant): self
     {
-        $this->subMerchant = $subMerchant;
+        $this->submerchant = $submerchant;
         return $this;
     }
 
diff --git a/src/Response/AddCardPaymentResponse.php b/src/Response/AddCardPaymentResponse.php
new file mode 100644
index 0000000..c058b0f
--- /dev/null
+++ b/src/Response/AddCardPaymentResponse.php
@@ -0,0 +1,79 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Paytrail\SDK\Response;
+
+use Paytrail\SDK\Interfaces\ResponseInterface;
+
+/**
+ * Class PaymentResponse
+ *
+ * Represents a response object of payment creation.
+ *
+ * @package Paytrail\SDK\Response
+ */
+class AddCardPaymentResponse implements ResponseInterface
+{
+    /**
+     * Assigned transaction ID for the payment.
+     *
+     * @var string|null
+     */
+    protected $transactionId;
+
+    /**
+     * URL to hosted payment gateway.
+     *
+     * @var string|null
+     */
+    protected $redirectUrl;
+
+    /**
+     * Get the transaction id.
+     *
+     * @return string|null
+     */
+    public function getTransactionId(): ?string
+    {
+        return $this->transactionId;
+    }
+
+    /**
+     * Set the transaction id.
+     *
+     * @param string|null $transactionId
+     *
+     * @return self Return self to enable chaining.
+     */
+    public function setTransactionId(?string $transactionId): AddCardPaymentResponse
+    {
+        $this->transactionId = $transactionId;
+
+        return $this;
+    }
+
+    /**
+     * Get the redirectUrl.
+     *
+     * @return string|null
+     */
+    public function getRedirectUrl(): ?string
+    {
+        return $this->redirectUrl;
+    }
+
+    /**
+     * Set the redirectUrl.
+     *
+     * @param string|null $redirectUrl
+     *
+     * @return self Return self to enable chaining.
+     */
+    public function setRedirectUrl(?string $redirectUrl): AddCardPaymentResponse
+    {
+        $this->redirectUrl = $redirectUrl;
+
+        return $this;
+    }
+}
diff --git a/src/Response/PaymentResponse.php b/src/Response/PaymentResponse.php
index 5ec4671..181fc8c 100644
--- a/src/Response/PaymentResponse.php
+++ b/src/Response/PaymentResponse.php
@@ -59,6 +59,13 @@ class PaymentResponse implements ResponseInterface
      */
     protected $providers = [];
 
+    /**
+     * Custom providers.
+     *
+     * @var array
+     */
+    protected $customProviders = [];
+
     /**
      * Get the transaction id.
      *
@@ -203,4 +210,27 @@ public function setProviders(array $providers): PaymentResponse
 
         return $this;
     }
+
+    /**
+     * Get custom providers.
+     *
+     * @return array
+     */
+    public function getCustomProviders(): array
+    {
+        return $this->customProviders ?? [];
+    }
+
+    /**
+     * Set custom providers.
+     *
+     * @param array|null $customProviders
+     * @return PaymentResponse
+     */
+    public function setCustomProviders(?array $customProviders): PaymentResponse
+    {
+        $this->customProviders = $customProviders;
+
+        return $this;
+    }
 }
diff --git a/tests/ClientTest.php b/tests/ClientTest.php
index 098d302..e0374cc 100644
--- a/tests/ClientTest.php
+++ b/tests/ClientTest.php
@@ -23,6 +23,7 @@
 use Paytrail\SDK\Request\RevertPaymentAuthHoldRequest;
 use Paytrail\SDK\Request\SettlementRequest;
 use Paytrail\SDK\Request\ShopInShopPaymentRequest;
+use Paytrail\SDK\Model\Provider;
 
 class ClientTest extends PaymentRequestTestCase
 {
@@ -46,7 +47,7 @@ protected function setUp(): void
 
         $this->item = (new Item())
             ->setProductCode('pr1')
-            ->setVatPercentage(24)
+            ->setVatPercentage(25.5)
             ->setReference('itemReference123')
             ->setStamp('itemStamp-1' . rand(1, 999999))
             ->setUnits(1)
@@ -56,7 +57,7 @@ protected function setUp(): void
         $this->item2 = (new Item())
             ->setDeliveryDate('2020-12-12')
             ->setProductCode('pr2')
-            ->setVatPercentage(24)
+            ->setVatPercentage(25.5)
             ->setReference('itemReference123')
             ->setStamp('itemStamp-2' . rand(1, 999999))
             ->setUnits(2)
@@ -215,7 +216,13 @@ public function testAddCardFormRequest()
 
     public function testGetTokenRequest()
     {
-        $checkoutTokenizationId = '818c478e-5682-46bf-97fd-b9c2b93a3fcd';
+        //  To update after 11/2026
+        //  Get new tokenization_id, card and customer details.
+        //  'add-card' action will return tokenization_id,
+        //  and with tokenization_id we could get card and customer details.
+        //  Card used: 0024 https://docs.paytrail.com/#/payment-method-providers?id=test-cards-for-payments
+
+        $checkoutTokenizationId = 'b34e5821-2a85-4840-8b27-21ef81168bec';
 
         $client = $this->client;
 
@@ -229,23 +236,23 @@ public function testGetTokenRequest()
         $responseJsonData = $response->jsonSerialize();
 
         $expectedArray = [
-            'token' => 'c7441208-c2a1-4a10-8eb6-458bd8eaa64f',
+            'token' => '798b445a-2216-46b7-ad1a-000f40ced6e8',
             'card' => [
                 'type' => 'Visa',
                 'bin' => '415301',
                 'partial_pan' => '0024',
-                'expire_year' => '2023',
+                'expire_year' => '2026',
                 'expire_month' => '11',
-                'cvc_required' => 'no',
+                'cvc_required' => 'not_tested',
                 'funding' => 'debit',
                 'category' => 'unknown',
                 'country_code' => 'FI',
                 'pan_fingerprint' => '693a68deec6d6fa363c72108f8d656d4fd0b6765f5457dd1c139523f4daaafce',
-                'card_fingerprint' => 'c34cdd1952deb81734c012fbb11eabc56c4d61d198f28b448327ccf13f45417f'
+                'card_fingerprint' => '24973f9037d418c0258ee61d90970c15a1c434a457d3974c9cdc12742f87c673'
             ],
             'customer' => [
-                'network_address' => '93.174.192.154',
-                'country_code' => 'FI'
+                'network_address' => '89.35.145.204',
+                'country_code' => 'PL'
             ]
         ];
 
@@ -260,7 +267,7 @@ public function testCitPaymentRequestCharge()
         $client = $this->client;
         $paymentRequest = $this->citPaymentRequest;
 
-        $citPaymentRequest = $paymentRequest->setToken('c7441208-c2a1-4a10-8eb6-458bd8eaa64f');
+        $citPaymentRequest = $paymentRequest->setToken('798b445a-2216-46b7-ad1a-000f40ced6e8');
 
         $this->assertTrue($citPaymentRequest->validate());
 
@@ -286,7 +293,7 @@ public function testMitPaymentRequestCharge()
         $client = $this->client;
         $paymentRequest = $this->mitPaymentRequest;
 
-        $mitPaymentRequest = $paymentRequest->setToken('c7441208-c2a1-4a10-8eb6-458bd8eaa64f');
+        $mitPaymentRequest = $paymentRequest->setToken('798b445a-2216-46b7-ad1a-000f40ced6e8');
 
         $this->assertTrue($mitPaymentRequest->validate());
 
@@ -309,10 +316,14 @@ public function testMitPaymentRequestCharge()
 
     public function testCitPaymentRequestCharge3DS()
     {
+        //  To update after 11/2026
+        //  Card required with 3DS
+        //  Card: 0170 https://docs.paytrail.com/#/payment-method-providers?id=test-cards-for-payments
+
         $client = $this->client;
         $paymentRequest = $this->citPaymentRequest;
 
-        $citPaymentRequest = $paymentRequest->setToken('40037d79-5c7f-4ffe-bf86-2d2025b64c36');
+        $citPaymentRequest = $paymentRequest->setToken('8d3cb70a-7911-42c4-81cd-5318a5f269a4');
 
         $this->assertTrue($citPaymentRequest->validate());
 
@@ -327,7 +338,7 @@ public function testCitPaymentRequestAuthorizationHold()
         $client = $this->client;
         $paymentRequest = $this->citPaymentRequest;
 
-        $citPaymentRequest = $paymentRequest->setToken('c7441208-c2a1-4a10-8eb6-458bd8eaa64f');
+        $citPaymentRequest = $paymentRequest->setToken('798b445a-2216-46b7-ad1a-000f40ced6e8');
 
         $this->assertTrue($citPaymentRequest->validate());
 
@@ -353,7 +364,7 @@ public function testMitPaymentRequestAuthorizationHold()
         $client = $this->client;
         $paymentRequest = $this->mitPaymentRequest;
 
-        $mitPaymentRequest = $paymentRequest->setToken('c7441208-c2a1-4a10-8eb6-458bd8eaa64f');
+        $mitPaymentRequest = $paymentRequest->setToken('798b445a-2216-46b7-ad1a-000f40ced6e8');
 
         $this->assertTrue($mitPaymentRequest->validate());
 
@@ -379,7 +390,7 @@ public function testCitPaymentRequestAuthorizationHold3DS()
         $client = $this->client;
         $paymentRequest = $this->citPaymentRequest;
 
-        $citPaymentRequest = $paymentRequest->setToken('40037d79-5c7f-4ffe-bf86-2d2025b64c36');
+        $citPaymentRequest = $paymentRequest->setToken('8d3cb70a-7911-42c4-81cd-5318a5f269a4');
 
         $this->assertTrue($citPaymentRequest->validate());
 
@@ -395,7 +406,7 @@ public function testCitPaymentRequestCommit()
         $paymentRequest = $this->citPaymentRequest;
         $transactionId = 'c12e224e-806f-11ea-9de3-33451a6f6d70';
 
-        $citPaymentRequest = $paymentRequest->setToken('c7441208-c2a1-4a10-8eb6-458bd8eaa64f');
+        $citPaymentRequest = $paymentRequest->setToken('798b445a-2216-46b7-ad1a-000f40ced6e8');
 
         $this->assertTrue($citPaymentRequest->validate());
 
@@ -409,7 +420,7 @@ public function testMitPaymentRequestCommit()
         $paymentRequest = $this->mitPaymentRequest;
         $transactionId = 'c12e224e-806f-11ea-9de3-33451a6f6d70';
 
-        $mitPaymentRequest = $paymentRequest->setToken('c7441208-c2a1-4a10-8eb6-458bd8eaa64f');
+        $mitPaymentRequest = $paymentRequest->setToken('798b445a-2216-46b7-ad1a-000f40ced6e8');
 
         $this->assertTrue($mitPaymentRequest->validate());
 
@@ -422,7 +433,7 @@ public function testRevertCitPaymentAuthorizationHold()
         $client = $this->client;
         $paymentRequest = $this->citPaymentRequest;
 
-        $citPaymentRequest = $paymentRequest->setToken('c7441208-c2a1-4a10-8eb6-458bd8eaa64f');
+        $citPaymentRequest = $paymentRequest->setToken('798b445a-2216-46b7-ad1a-000f40ced6e8');
 
         $this->assertTrue($citPaymentRequest->validate());
 
@@ -447,7 +458,7 @@ public function testRevertMitPaymentAuthorizationHold()
         $client = $this->client;
         $paymentRequest = $this->mitPaymentRequest;
 
-        $mitPaymentRequest = $paymentRequest->setToken('c7441208-c2a1-4a10-8eb6-458bd8eaa64f');
+        $mitPaymentRequest = $paymentRequest->setToken('798b445a-2216-46b7-ad1a-000f40ced6e8');
 
         $this->assertTrue($mitPaymentRequest->validate());
 
@@ -510,7 +521,8 @@ public function testGetGroupedPaymentProvidersAcceptsLanguageParameters()
     {
         $providers = $this->client->getGroupedPaymentProviders(100, 'EN');
         $this->assertIsArray($providers);
-        $this->assertEquals('Mobile payment methods', $providers['groups'][0]['name']);
+        // Get first provider groups providers and select first provider from array.
+        $this->assertInstanceOf(Provider::class, $providers['groups'][0]['providers'][0]);
     }
 
     public function testRequestPaymentReportReturnsRequestId()
@@ -609,4 +621,11 @@ public function testRequestPaymentReportThrowsExceptionWhenEndDateIsInWrongForma
             ->setEndDate('1.1.2023');
         $this->client->requestPaymentReport($reportRequest);
     }
+
+    public function testPayAndAddCardReturnsTransactionIdAndUrl()
+    {
+        $response = $this->client->createPaymentAndAddCard($this->paymentRequest);
+        $this->assertIsString($response->getTransactionId());
+        $this->assertIsString($response->getRedirectUrl());
+    }
 }
diff --git a/tests/Model/ItemTest.php b/tests/Model/ItemTest.php
index b544c34..424768d 100644
--- a/tests/Model/ItemTest.php
+++ b/tests/Model/ItemTest.php
@@ -83,9 +83,19 @@ public function testItemWithoutProductCodeThrowsError()
     public static function providerForUnitPriceLimitValues()
     {
         return [
-            'Negative amount' => [-1, false],
-            'Zero amount' => [0, true],
-            'Maximum amount' => [99999999, true],
+            'Negative amount'     => [-1, true],
+            'Zero amount'         => [0, true],
+            'Maximum amount'      => [99999999, true],
+            'Over maximum amount' => [100000000, false]
+        ];
+    }
+
+    public static function providerForUnitPriceLimitValuesShopInShop()
+    {
+        return [
+            'Negative amount'     => [-1, false],
+            'Zero amount'         => [0, true],
+            'Maximum amount'      => [99999999, true],
             'Over maximum amount' => [100000000, false]
         ];
     }
diff --git a/tests/Request/ShopInShopPaymentRequestTest.php b/tests/Request/ShopInShopPaymentRequestTest.php
index b55f965..fce2d4c 100644
--- a/tests/Request/ShopInShopPaymentRequestTest.php
+++ b/tests/Request/ShopInShopPaymentRequestTest.php
@@ -129,4 +129,82 @@ public function testShopInShopPaymentRequestFail()
 
         $r->validate();
     }
+
+    public static function shopInShopPaymentRequestItems()
+    {
+        return [
+            'negative item failing validation' => [
+                'itemsPrice'     => [20, -10],
+                'amount'         => 10,
+                'expectedResult' => false
+            ],
+            'positive validation'              => [
+                'itemsPrice'     => [20, 10],
+                'amount'         => 30,
+                'expectedResult' => true
+            ],
+        ];
+    }
+
+    /**
+     * @dataProvider shopInShopPaymentRequestItems
+     */
+    public function testNegativeRowsValidation($itemsPrice, $amount, $expectedResult)
+    {
+        $r = new ShopInShopPaymentRequest();
+        $r->setAmount($amount);
+        $r->setStamp('RequestStamp');
+        $r->setReference('RequestReference123');
+        $r->setCurrency('EUR');
+        $r->setLanguage('EN');
+
+        $i     = 0;
+        $items = [];
+        foreach ($itemsPrice as $price) {
+            $com = new Commission();
+            $com->setMerchant('123456');
+            $com->setAmount(2);
+
+            $item = new Item();
+            $item->setStamp('someStamp' . $i)
+                ->setDeliveryDate('12.12.2020')
+                ->setProductCode('pr1' . $i)
+                ->setVatPercentage(25)
+                ->setUnitPrice($price)
+                ->setUnits(1)
+                ->setMerchant('222222')
+                ->setReference('1-2')
+                ->setCommission($com);
+
+            $items[] = $item;
+            $i++;
+        }
+
+        $r->setItems($items);
+
+        $c = new Customer();
+        $c->setEmail('customer@email.com');
+
+        $r->setCustomer($c);
+
+        $cb = new CallbackUrl();
+        $cb->setCancel('https://somedomain.com/cancel')
+            ->setSuccess('https://somedomain.com/success');
+
+        $r->setCallbackUrls($cb);
+
+        $redirect = new CallbackUrl();
+        $redirect->setSuccess('https://someother.com/success')
+            ->setCancel('https://someother.com/cancel');
+
+        $r->setRedirectUrls($redirect);
+
+        try {
+            $result = $r->validate();
+        } catch (ValidationException $e) {
+            $result = false;
+        }
+
+        $this->assertEquals($expectedResult, $result);
+    }
 }