diff --git a/Api.php b/Api.php
index 4728997..c932381 100644
--- a/Api.php
+++ b/Api.php
@@ -56,6 +56,7 @@ public function prepareTransaction(ArrayObject $details, string $returnUrl, stri
         $lineItem = $this->createPostFinanceModel(LineItemCreate::class, [
             'quantity'           => 1,
             'amountIncludingTax' => $transactionExtender['amount'] / 100,
+            'taxes'              => $transactionExtender['totalTaxes'] ?? null,
             'uniqueId'           => $transactionExtender['id'],
             'name'               => $transactionExtender['id'],
             'sku'                => $transactionExtender['id'],
diff --git a/README.md b/README.md
index a429130..0f5a33b 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,12 @@ Payum Gateway For [PostFinance Checkout](https://checkout.postfinance.ch)
 - PHP 8.0+
 - [Payum](https://github.com/Payum/Payum)
 
+## Information
+This extension currently **does not** support multiple line items. 
+It only creates one line item which contains all the total information of the given order.
+
+***
+
 ## BackOffice
 
 ### Environments
@@ -13,7 +19,13 @@ Use multiple spaces to determine test/production.
 ### Webhook
 You need to define a global webhook: `https://your-domain.com/payment/notify/unsafe/[YOUR_POSTFINANCE_FLEX_GATEWAY_NAME]`
 
+***
+
 ## Changelog
+
+### 1.2.0
+- dependency `postfinancecheckout/sdk:^4.1` added
+- added `totalTaxes` to transaction extender to allow tax rates submission to line item
 ### 1.1.1
 - change payment state to `authorized` if transaction state is `completed`
 ### 1.1.0
diff --git a/Transaction/Transaction.php b/Transaction/Transaction.php
index 6778aef..66b6877 100644
--- a/Transaction/Transaction.php
+++ b/Transaction/Transaction.php
@@ -11,6 +11,7 @@ class Transaction
     protected int|float $amount;
     protected ?string $currency;
     protected ?string $language = null;
+    protected ?array $totalTaxes = null;
     protected ?array $allowedPaymentMethodBrands = null;
     protected ?array $allowedPaymentMethodConfigurations = null;
 
@@ -57,6 +58,16 @@ public function setLanguage(?string $language): void
         $this->language = $language;
     }
 
+    public function getTotalTaxes(): ?array
+    {
+        return $this->totalTaxes;
+    }
+
+    public function setTotalTaxes(?array $totalTaxes): void
+    {
+        $this->totalTaxes = $totalTaxes;
+    }
+
     public function getAllowedPaymentMethodBrands(): ?array
     {
         return $this->allowedPaymentMethodBrands;
@@ -104,6 +115,7 @@ public function toArray(): array
             'amount'                             => $this->getAmount(),
             'currency'                           => $this->getCurrency(),
             'language'                           => $this->getLanguage(),
+            'totalTaxes'                         => $this->getTotalTaxes(),
             'allowedPaymentMethodBrands'         => $this->getAllowedPaymentMethodBrands(),
             'allowedPaymentMethodConfigurations' => $this->getAllowedPaymentMethodConfigurations(),
             'shippingAddress'                    => $this->shippingAddress === null ? [] : (array) ObjectSerializer::sanitizeForSerialization($this->shippingAddress),
@@ -113,7 +125,5 @@ public function toArray(): array
         return array_filter($data, static function ($row) {
             return $row !== null;
         });
-
     }
-
 }
diff --git a/composer.json b/composer.json
index c82a6de..706c33d 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,8 @@
         }
     ],
     "require": {
-        "payum/core": "^1.6"
+        "payum/core": "^1.6",
+        "postfinancecheckout/sdk": "^4.1"
     },
     "extra": {
         "branch-alias": {