diff --git a/src/Constants/IdStrings.php b/src/Constants/IdStrings.php
index 662c9ea96..4634335b5 100755
--- a/src/Constants/IdStrings.php
+++ b/src/Constants/IdStrings.php
@@ -16,6 +16,7 @@ class IdStrings
     public const CHARGEBACK = 'cbk';
     public const PAYOUT = 'out';
     public const PREAUTHORIZE = 'preaut';
+    public const SCA = 'sca';
     public const SHIPMENT = 'shp';
 
     // Payment Types
diff --git a/src/Constants/TransactionTypes.php b/src/Constants/TransactionTypes.php
index 3a4721b18..111bed024 100755
--- a/src/Constants/TransactionTypes.php
+++ b/src/Constants/TransactionTypes.php
@@ -18,4 +18,5 @@ class TransactionTypes
     public const SHIPMENT = 'shipment';
     public const PAYOUT = 'payout';
     public const CHARGEBACK = 'chargeback';
+    public const SCA = 'sca';
 }
diff --git a/src/Interfaces/PaymentServiceInterface.php b/src/Interfaces/PaymentServiceInterface.php
index d4613979e..ad05a505e 100644
--- a/src/Interfaces/PaymentServiceInterface.php
+++ b/src/Interfaces/PaymentServiceInterface.php
@@ -24,6 +24,7 @@
 use UnzerSDK\Resources\TransactionTypes\Authorization;
 use UnzerSDK\Resources\TransactionTypes\Charge;
 use UnzerSDK\Resources\TransactionTypes\Payout;
+use UnzerSDK\Resources\TransactionTypes\Sca;
 use UnzerSDK\Resources\TransactionTypes\Shipment;
 
 interface PaymentServiceInterface
@@ -389,4 +390,20 @@ public function fetchInstallmentPlans(
      * @return PaylaterInstallmentPlans
      */
     public function fetchPaylaterInstallmentPlans(InstallmentPlansQuery $plansRequest): PaylaterInstallmentPlans;
+
+    /**
+     * Perform an SCA transaction.
+     *
+     * @param Sca $sca The SCA object.
+     * @param BasePaymentType|string $paymentType The payment type object or ID.
+     * @param Customer|string|null $customer The customer object or ID.
+     * @param Metadata|null $metadata The metadata object.
+     * @param Basket|null $basket The basket object.
+     *
+     * @return Sca The resulting SCA object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function performSca(Sca $sca, $paymentType, $customer = null, ?Metadata $metadata = null, ?Basket $basket = null): Sca;
 }
diff --git a/src/Interfaces/ResourceServiceInterface.php b/src/Interfaces/ResourceServiceInterface.php
index 6f26b0ad1..22c752c32 100644
--- a/src/Interfaces/ResourceServiceInterface.php
+++ b/src/Interfaces/ResourceServiceInterface.php
@@ -25,6 +25,7 @@
 use UnzerSDK\Resources\TransactionTypes\Charge;
 use UnzerSDK\Resources\TransactionTypes\Chargeback;
 use UnzerSDK\Resources\TransactionTypes\Payout;
+use UnzerSDK\Resources\TransactionTypes\Sca;
 use UnzerSDK\Resources\TransactionTypes\Shipment;
 
 interface ResourceServiceInterface
@@ -452,4 +453,29 @@ public function fetchShipment($payment, string $shipmentId): Shipment;
      * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
      */
     public function fetchConfig(BasePaymentType $paymentType, ?Config $config = null): Config;
+
+    /**
+     * Fetches an SCA transaction.
+     *
+     * @param Sca $sca The SCA object to fetch.
+     *
+     * @return Sca The fetched SCA object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function fetchSca(Sca $sca): Sca;
+
+    /**
+     * Fetches an SCA transaction by payment ID and SCA ID.
+     *
+     * @param Payment|string $payment The payment object or payment ID.
+     * @param string $scaId The SCA transaction ID.
+     *
+     * @return Sca The fetched SCA object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function fetchScaById($payment, string $scaId): Sca;
 }
diff --git a/src/Resources/Payment.php b/src/Resources/Payment.php
index 4a75656b4..65dd979bf 100755
--- a/src/Resources/Payment.php
+++ b/src/Resources/Payment.php
@@ -19,6 +19,7 @@
 use UnzerSDK\Resources\TransactionTypes\Chargeback;
 use UnzerSDK\Resources\TransactionTypes\Payout;
 use UnzerSDK\Resources\TransactionTypes\PreAuthorization;
+use UnzerSDK\Resources\TransactionTypes\Sca;
 use UnzerSDK\Resources\TransactionTypes\Shipment;
 use UnzerSDK\Services\IdService;
 use UnzerSDK\Traits\HasInvoiceId;
@@ -58,6 +59,9 @@ class Payment extends AbstractUnzerResource
     /** @var Chargeback[] $chargebacks */
     private $chargebacks = [];
 
+    /** @var Sca|null $sca */
+    private $sca;
+
 
     /**
      * Associative array using the ID of the cancellations as the key.
@@ -337,6 +341,32 @@ public function getChargeByIndex(int $index, bool $lazy = false)
         return $resource;
     }
 
+    /**
+     * Returns the SCA transaction of this Payment.
+     */
+    public function getSca(bool $lazy = false): ?Sca
+    {
+        $sca = $this->sca;
+        if (!$lazy && $sca !== null) {
+            return $this->getResource($sca);
+        }
+        return $sca;
+    }
+
+    /**
+     * Adds an SCA object to this Payment.
+     *
+     * @param Sca $sca
+     *
+     * @return $this
+     */
+    public function setSca(Sca $sca): self
+    {
+        $sca->setPayment($this);
+        $this->sca = $sca;
+        return $this;
+    }
+
     /**
      * Reference this payment object to the passed Customer resource.
      * The Customer resource can be passed as Customer object or the Id of a Customer resource.
@@ -924,6 +954,9 @@ private function updateResponseTransactions(array $transactions = []): void
                 case TransactionTypes::CHARGEBACK:
                     $this->updateChargebackTransaction($transaction);
                     break;
+                case TransactionTypes::SCA:
+                    $this->updateScaTransaction($transaction);
+                    break;
                 default:
                     // skip
                     break;
@@ -1191,4 +1224,25 @@ private function updateChargebackTransaction(stdClass $transaction): void
 
         $chargeback->handleResponse($transaction);
     }
+
+    /**
+     * This updates the local SCA object referenced by this Payment with the given SCA transaction
+     * from the Payment response.
+     *
+     * @param stdClass $transaction The transaction from the Payment response containing the SCA data.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    private function updateScaTransaction(stdClass $transaction): void
+    {
+        $transactionId = IdService::getResourceIdFromUrl($transaction->url, IdStrings::SCA);
+        $sca = $this->sca;
+        if (!$sca instanceof Sca) {
+            $sca = (new Sca())->setPayment($this)->setId($transactionId);
+            $this->setSca($sca);
+        }
+
+        $sca->handleResponse($transaction);
+    }
 }
diff --git a/src/Resources/TransactionTypes/AbstractTransactionType.php b/src/Resources/TransactionTypes/AbstractTransactionType.php
index 70bd0802e..05093caf9 100755
--- a/src/Resources/TransactionTypes/AbstractTransactionType.php
+++ b/src/Resources/TransactionTypes/AbstractTransactionType.php
@@ -39,6 +39,9 @@ abstract class AbstractTransactionType extends AbstractUnzerResource
     use HasAdditionalTransactionData;
     use HasDate;
 
+    /** @var float $amount */
+    protected $amount;
+
 
     /** @var Payment $payment */
     private $payment;
@@ -242,4 +245,23 @@ protected function handleWeroTransactionData(stdClass $additionalTransactionData
             $this->setWeroTransactionData($weroTransactionData);
         }
     }
+
+    /**
+     * @param float|null $amount
+     *
+     * @return Charge
+     */
+    public function setAmount(?float $amount): self
+    {
+        $this->amount = $amount !== null ? round($amount, 4) : null;
+        return $this;
+    }
+
+    /**
+     * @return float|null
+     */
+    public function getAmount(): ?float
+    {
+        return $this->amount;
+    }
 }
diff --git a/src/Resources/TransactionTypes/Authorization.php b/src/Resources/TransactionTypes/Authorization.php
index 6936b8b84..4df8d113c 100755
--- a/src/Resources/TransactionTypes/Authorization.php
+++ b/src/Resources/TransactionTypes/Authorization.php
@@ -62,25 +62,6 @@ public function __construct(?float $amount = null, ?string $currency = null, ?st
         $this->setReturnUrl($returnUrl);
     }
 
-    /**
-     * @return float|null
-     */
-    public function getAmount(): ?float
-    {
-        return $this->amount;
-    }
-
-    /**
-     * @param float|null $amount
-     *
-     * @return self
-     */
-    public function setAmount(?float $amount): self
-    {
-        $this->amount = $amount !== null ? round($amount, 4) : null;
-        return $this;
-    }
-
     /**
      * @return float|null
      */
diff --git a/src/Resources/TransactionTypes/Cancellation.php b/src/Resources/TransactionTypes/Cancellation.php
index ad41d1c22..51f0d86e0 100755
--- a/src/Resources/TransactionTypes/Cancellation.php
+++ b/src/Resources/TransactionTypes/Cancellation.php
@@ -16,13 +16,6 @@
  */
 class Cancellation extends AbstractTransactionType
 {
-    /**
-     * The cancellation amount will be transferred as grossAmount in case of Installment Secured payment type.
-     *
-     * @var float $amount
-     */
-    protected $amount;
-
     /** @var string $reasonCode */
     protected $reasonCode;
 
@@ -53,29 +46,6 @@ public function __construct(?float $amount = null)
         $this->setAmount($amount);
     }
 
-    /**
-     * Returns the cancellationAmount (equals grossAmount in case of Installment Secured).
-     *
-     * @return float|null
-     */
-    public function getAmount(): ?float
-    {
-        return $this->amount;
-    }
-
-    /**
-     * Sets the cancellationAmount (equals grossAmount in case of Installment Secured).
-     *
-     * @param float|null $amount
-     *
-     * @return Cancellation
-     */
-    public function setAmount(?float $amount): self
-    {
-        $this->amount = $amount !== null ? round($amount, 4) : null;
-        return $this;
-    }
-
     /**
      * Returns the reason code of the cancellation if set.
      *
diff --git a/src/Resources/TransactionTypes/Charge.php b/src/Resources/TransactionTypes/Charge.php
index 278cc9c3b..338bca79d 100755
--- a/src/Resources/TransactionTypes/Charge.php
+++ b/src/Resources/TransactionTypes/Charge.php
@@ -25,9 +25,6 @@ class Charge extends AbstractTransactionType
     use HasDescriptor;
     use HasChargebacks;
 
-    /** @var float $amount */
-    protected $amount;
-
     /** @var string $currency */
     protected $currency;
 
@@ -54,25 +51,6 @@ public function __construct(?float $amount = null, ?string $currency = null, ?st
         $this->setReturnUrl($returnUrl);
     }
 
-    /**
-     * @return float|null
-     */
-    public function getAmount(): ?float
-    {
-        return $this->amount;
-    }
-
-    /**
-     * @param float|null $amount
-     *
-     * @return self
-     */
-    public function setAmount(?float $amount): self
-    {
-        $this->amount = $amount !== null ? round($amount, 4) : null;
-        return $this;
-    }
-
     /**
      * @return float|null
      */
diff --git a/src/Resources/TransactionTypes/Chargeback.php b/src/Resources/TransactionTypes/Chargeback.php
index 2ef22d038..607ebe7a5 100644
--- a/src/Resources/TransactionTypes/Chargeback.php
+++ b/src/Resources/TransactionTypes/Chargeback.php
@@ -12,9 +12,6 @@
  */
 class Chargeback extends AbstractTransactionType
 {
-    /** @var float $amount */
-    protected $amount;
-
     /** @var string $currency */
     protected $currency;
 
@@ -29,27 +26,6 @@ public function __construct(?float $amount = null)
         $this->setAmount($amount);
     }
 
-    /**
-     * @return float|null
-     */
-    public function getAmount(): ?float
-    {
-        return $this->amount;
-    }
-
-    /**
-     * Sets the cancellationAmount (equals grossAmount in case of Installment Secured).
-     *
-     * @param float|null $amount
-     *
-     * @return Cancellation
-     */
-    public function setAmount(?float $amount): self
-    {
-        $this->amount = $amount !== null ? round($amount, 4) : null;
-        return $this;
-    }
-
     /**
      * @return string
      */
diff --git a/src/Resources/TransactionTypes/Payout.php b/src/Resources/TransactionTypes/Payout.php
index 15f0767ca..2f39d5a0d 100644
--- a/src/Resources/TransactionTypes/Payout.php
+++ b/src/Resources/TransactionTypes/Payout.php
@@ -12,9 +12,6 @@
  */
 class Payout extends AbstractTransactionType
 {
-    /** @var float|null $amount */
-    protected $amount;
-
     /** @var string|null $currency */
     protected $currency;
 
@@ -31,25 +28,6 @@ public function __construct(?float $amount = null, ?string $currency = null, $re
         $this->setReturnUrl($returnUrl);
     }
 
-    /**
-     * @return float|null
-     */
-    public function getAmount(): ?float
-    {
-        return $this->amount;
-    }
-
-    /**
-     * @param float|null $amount
-     *
-     * @return self
-     */
-    public function setAmount(?float $amount): self
-    {
-        $this->amount = $amount !== null ? round($amount, 4) : null;
-        return $this;
-    }
-
     /**
      * @return string|null
      */
diff --git a/src/Resources/TransactionTypes/Sca.php b/src/Resources/TransactionTypes/Sca.php
new file mode 100644
index 000000000..7c6b2a180
--- /dev/null
+++ b/src/Resources/TransactionTypes/Sca.php
@@ -0,0 +1,131 @@
+<?php
+
+namespace UnzerSDK\Resources\TransactionTypes;
+
+use UnzerSDK\Adapter\HttpAdapterInterface;
+use UnzerSDK\Traits\HasAccountInformation;
+use UnzerSDK\Traits\HasDescriptor;
+use UnzerSDK\Traits\HasRecurrenceType;
+
+/**
+ * This represents the SCA (Strong Customer Authentication) transaction.
+ *
+ * @link  https://docs.unzer.com/
+ *
+ */
+class Sca extends AbstractTransactionType
+{
+    use HasRecurrenceType;
+    use HasAccountInformation;
+    use HasDescriptor;
+
+    /** @var string $currency */
+    protected $currency;
+
+    /** @var string $returnUrl */
+    protected $returnUrl;
+
+    /** @var string $paymentReference */
+    protected $paymentReference;
+
+    /** @var bool $card3ds */
+    protected $card3ds;
+
+    /**
+     * Sca constructor.
+     *
+     * @param float|null $amount
+     * @param string|null $currency
+     * @param string|null $returnUrl
+     */
+    public function __construct(?float $amount = null, ?string $currency = null, ?string $returnUrl = null)
+    {
+        $this->setAmount($amount);
+        $this->setCurrency($currency);
+        $this->setReturnUrl($returnUrl);
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getCurrency(): ?string
+    {
+        return $this->currency;
+    }
+
+    /**
+     * @param string|null $currency
+     *
+     * @return self
+     */
+    public function setCurrency(?string $currency): self
+    {
+        $this->currency = $currency;
+        return $this;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getReturnUrl(): ?string
+    {
+        return $this->returnUrl;
+    }
+
+    /**
+     * @param string|null $returnUrl
+     *
+     * @return self
+     */
+    public function setReturnUrl(?string $returnUrl): self
+    {
+        $this->returnUrl = $returnUrl;
+        return $this;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getPaymentReference(): ?string
+    {
+        return $this->paymentReference;
+    }
+
+    /**
+     * @param string|null $referenceText
+     *
+     * @return Sca
+     */
+    public function setPaymentReference(?string $referenceText): Sca
+    {
+        $this->paymentReference = $referenceText;
+        return $this;
+    }
+
+    /**
+     * @return bool|null
+     */
+    public function isCard3ds(): ?bool
+    {
+        return $this->card3ds;
+    }
+
+    /**
+     * @param bool|null $card3ds
+     *
+     * @return Sca
+     */
+    public function setCard3ds(?bool $card3ds): Sca
+    {
+        $this->card3ds = $card3ds;
+        return $this;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function getResourcePath(string $httpMethod = HttpAdapterInterface::REQUEST_GET): string
+    {
+        return 'sca';
+    }
+}
diff --git a/src/Resources/TransactionTypes/Shipment.php b/src/Resources/TransactionTypes/Shipment.php
index 55dfbc7d5..d29e09cc8 100755
--- a/src/Resources/TransactionTypes/Shipment.php
+++ b/src/Resources/TransactionTypes/Shipment.php
@@ -12,28 +12,6 @@
  */
 class Shipment extends AbstractTransactionType
 {
-    /** @var float|null $amount */
-    protected $amount;
-
-    /**
-     * @return float|null
-     */
-    public function getAmount(): ?float
-    {
-        return $this->amount;
-    }
-
-    /**
-     * @param float|null $amount
-     *
-     * @return Shipment
-     */
-    public function setAmount(?float $amount): self
-    {
-        $this->amount = $amount !== null ? round($amount, 4) : null;
-        return $this;
-    }
-
     /**
      * {@inheritDoc}
      */
diff --git a/src/Services/PaymentService.php b/src/Services/PaymentService.php
index 8eefc3597..de6954115 100755
--- a/src/Services/PaymentService.php
+++ b/src/Services/PaymentService.php
@@ -22,6 +22,7 @@
 use UnzerSDK\Resources\TransactionTypes\Authorization;
 use UnzerSDK\Resources\TransactionTypes\Charge;
 use UnzerSDK\Resources\TransactionTypes\Payout;
+use UnzerSDK\Resources\TransactionTypes\Sca;
 use UnzerSDK\Resources\TransactionTypes\Shipment;
 use UnzerSDK\Unzer;
 
@@ -392,4 +393,32 @@ private function createPayment($paymentType): AbstractUnzerResource
     {
         return (new Payment($this->unzer))->setPaymentType($paymentType);
     }
+
+    /**
+     * Perform an SCA transaction.
+     *
+     * @param Sca $sca The SCA object to be executed.
+     * @param BasePaymentType|string $paymentType The payment type object or its ID.
+     * @param Customer|string|null $customer The customer object or ID.
+     * @param Metadata|null $metadata The metadata object.
+     * @param Basket|null $basket The basket object.
+     *
+     * @return Sca The resulting SCA object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function performSca(Sca $sca, $paymentType, $customer = null, ?Metadata $metadata = null, ?Basket $basket = null): Sca
+    {
+        $payment = $this->createPayment($paymentType);
+        $paymentType = $payment->getPaymentType();
+
+        /** @var Sca $sca */
+        $sca->setSpecialParams($paymentType->getTransactionParams() ?? []);
+        $payment->setSca($sca)->setCustomer($customer)->setMetadata($metadata)->setBasket($basket);
+
+        $this->getResourceService()->createResource($sca);
+
+        return $sca;
+    }
 }
diff --git a/src/Services/ResourceService.php b/src/Services/ResourceService.php
index 16821523e..90b095782 100755
--- a/src/Services/ResourceService.php
+++ b/src/Services/ResourceService.php
@@ -59,6 +59,7 @@
 use UnzerSDK\Resources\TransactionTypes\Charge;
 use UnzerSDK\Resources\TransactionTypes\Chargeback;
 use UnzerSDK\Resources\TransactionTypes\Payout;
+use UnzerSDK\Resources\TransactionTypes\Sca;
 use UnzerSDK\Resources\TransactionTypes\Shipment;
 use UnzerSDK\Resources\V2\Customer as CustomerV2;
 use UnzerSDK\Resources\V2\Paypage as PaypageV2;
@@ -222,6 +223,12 @@ public function fetchResourceByUrl($url)
             case $resourceType === IdStrings::PAYOUT:
                 $resource = $unzer->fetchPayout(IdService::getResourceIdFromUrl($url, IdStrings::PAYMENT));
                 break;
+            case $resourceType === IdStrings::SCA:
+                $resource = $unzer->fetchScaById(
+                    IdService::getResourceIdFromUrl($url, IdStrings::PAYMENT),
+                    $resourceId
+                );
+                break;
             case $resourceType === IdStrings::PAYMENT:
                 $resource = $unzer->fetchPayment($resourceId);
                 break;
@@ -980,4 +987,44 @@ public static function getTypeInstanceFromIdString($typeId): BasePaymentType
         }
         return $paymentType;
     }
+
+    /**
+     * Fetches an SCA transaction.
+     *
+     * @param Sca $sca The SCA object to fetch.
+     *
+     * @return Sca The fetched SCA object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function fetchSca(Sca $sca): Sca
+    {
+        $this->fetchResource($sca);
+        return $sca;
+    }
+
+    /**
+     * Fetches an SCA transaction by payment ID and SCA ID.
+     *
+     * @param Payment|string $payment The payment object or payment ID.
+     * @param string $scaId The SCA transaction ID.
+     *
+     * @return Sca The fetched SCA object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function fetchScaById($payment, string $scaId): Sca
+    {
+        $paymentObject = $this->fetchPayment($payment);
+        $sca = $paymentObject->getSca($scaId, true);
+
+        if (!$sca instanceof Sca) {
+            throw new RuntimeException('The SCA object could not be found.');
+        }
+
+        $this->fetchResource($sca);
+        return $sca;
+    }
 }
diff --git a/src/Unzer.php b/src/Unzer.php
index a0bb6570c..e0f8b45d1 100644
--- a/src/Unzer.php
+++ b/src/Unzer.php
@@ -33,6 +33,7 @@
 use UnzerSDK\Resources\TransactionTypes\Charge;
 use UnzerSDK\Resources\TransactionTypes\Chargeback;
 use UnzerSDK\Resources\TransactionTypes\Payout;
+use UnzerSDK\Resources\TransactionTypes\Sca;
 use UnzerSDK\Resources\TransactionTypes\Shipment;
 use UnzerSDK\Resources\V2\Paypage as PaypageV2;
 use UnzerSDK\Resources\Webhook;
@@ -812,6 +813,126 @@ public function performChargeOnPayment($payment, Charge $charge): Charge
         return $this->paymentService->performChargeOnPayment($payment, $charge);
     }
 
+    /**
+     * Perform an SCA transaction.
+     *
+     * @param Sca $sca The SCA object.
+     * @param BasePaymentType|string $paymentType The payment type object or ID.
+     * @param Customer|string|null $customer The customer object or ID.
+     * @param Metadata|null $metadata The metadata object.
+     * @param Basket|null $basket The basket object.
+     *
+     * @return Sca The resulting SCA object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function performSca(Sca $sca, $paymentType, $customer = null, ?Metadata $metadata = null, ?Basket $basket = null): Sca
+    {
+        return $this->paymentService->performSca($sca, $paymentType, $customer, $metadata, $basket);
+    }
+
+    /**
+     * Fetch an SCA transaction.
+     *
+     * @param Sca $sca The SCA object to fetch.
+     *
+     * @return Sca The fetched SCA object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function fetchSca(Sca $sca): Sca
+    {
+        return $this->resourceService->fetchSca($sca);
+    }
+
+    /**
+     * Fetch an SCA transaction by payment ID and SCA ID.
+     *
+     * @param Payment|string $payment The payment object or payment ID.
+     * @param string $scaId The SCA transaction ID.
+     *
+     * @return Sca The fetched SCA object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function fetchScaById($payment, string $scaId): Sca
+    {
+        return $this->resourceService->fetchScaById($payment, $scaId);
+    }
+
+    /**
+     * Charge an SCA transaction.
+     *
+     * @param Payment|string $payment The payment object or payment ID.
+     * @param string $scaId The SCA transaction ID.
+     * @param float|null $amount The amount to charge.
+     * @param string|null $orderId The order ID.
+     * @param string|null $invoiceId The invoice ID.
+     *
+     * @return Charge The resulting Charge object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function chargeScaTransaction($payment, string $scaId, ?float $amount = null, ?string $orderId = null, ?string $invoiceId = null): Charge
+    {
+        $charge = new Charge($amount);
+        $charge->setOrderId($orderId)->setInvoiceId($invoiceId);
+
+        $paymentObject = $this->resourceService->getPaymentResource($payment);
+        $sca = $paymentObject->getSca($scaId, true);
+
+        if (!$sca instanceof Sca) {
+            throw new RuntimeException('SCA transaction not found.');
+        }
+
+        $sca->addCharge($charge);
+        $charge->setPayment($paymentObject);
+        $charge->setParentResource($sca);
+
+        $this->resourceService->createResource($charge);
+
+        return $charge;
+    }
+
+    /**
+     * Authorize an SCA transaction.
+     *
+     * @param Payment|string $payment The payment object or payment ID.
+     * @param string $scaId The SCA transaction ID.
+     * @param float|null $amount The amount to authorize.
+     * @param string|null $orderId The order ID.
+     * @param string|null $invoiceId The invoice ID.
+     *
+     * @return Authorization The resulting Authorization object.
+     *
+     * @throws UnzerApiException An UnzerApiException is thrown if there is an error returned on API-request.
+     * @throws RuntimeException  A RuntimeException is thrown when there is an error while using the SDK.
+     */
+    public function authorizeScaTransaction($payment, string $scaId, ?float $amount = null, ?string $orderId = null, ?string $invoiceId = null): Authorization
+    {
+        $authorization = new Authorization($amount, null, null);
+        $authorization->setOrderId($orderId)->setInvoiceId($invoiceId);
+
+        $paymentObject = $this->resourceService->getPaymentResource($payment);
+        $sca = $paymentObject->getSca($scaId, true);
+
+        if (!$sca instanceof Sca) {
+            throw new RuntimeException('SCA transaction not found.');
+        }
+
+        $sca->addAuthorization($authorization);
+        $authorization->setPayment($paymentObject);
+        $authorization->setParentResource($sca);
+
+        $this->resourceService->createResource($authorization);
+
+        return $authorization;
+    }
+
     /**
      * {@inheritDoc}
      */
diff --git a/test/Fixtures/jsonData/scaPaymentResponse.json b/test/Fixtures/jsonData/scaPaymentResponse.json
new file mode 100644
index 000000000..f897f5a69
--- /dev/null
+++ b/test/Fixtures/jsonData/scaPaymentResponse.json
@@ -0,0 +1,33 @@
+{
+  "id": "s-sca-1",
+  "isSuccess": true,
+  "isPending": false,
+  "isResumed": false,
+  "isError": false,
+  "card3ds": true,
+  "redirectUrl": "",
+  "message": {
+    "code": "COR.000.100.200",
+    "merchant": "Transaction succeeded",
+    "customer": "Your payments have been successfully processed."
+  },
+  "amount": "119.0000",
+  "currency": "EUR",
+  "date": "2023-02-28 08:00:00",
+  "resources": {
+    "customerId": "",
+    "paymentId": "s-pay-123",
+    "basketId": "",
+    "metadataId": "",
+    "payPageId": "",
+    "traceId": "trace-123",
+    "typeId": "s-crd-123"
+  },
+  "paymentReference": "",
+  "processing": {
+    "uniqueId": "31HA0xyz",
+    "shortId": "1234.1234.1234",
+    "3dsEci": "3DS_SUCCESS",
+    "traceId": "trace-123"
+  }
+}
\ No newline at end of file
diff --git a/test/Fixtures/jsonData/scaResponse.json b/test/Fixtures/jsonData/scaResponse.json
new file mode 100644
index 000000000..f897f5a69
--- /dev/null
+++ b/test/Fixtures/jsonData/scaResponse.json
@@ -0,0 +1,33 @@
+{
+  "id": "s-sca-1",
+  "isSuccess": true,
+  "isPending": false,
+  "isResumed": false,
+  "isError": false,
+  "card3ds": true,
+  "redirectUrl": "",
+  "message": {
+    "code": "COR.000.100.200",
+    "merchant": "Transaction succeeded",
+    "customer": "Your payments have been successfully processed."
+  },
+  "amount": "119.0000",
+  "currency": "EUR",
+  "date": "2023-02-28 08:00:00",
+  "resources": {
+    "customerId": "",
+    "paymentId": "s-pay-123",
+    "basketId": "",
+    "metadataId": "",
+    "payPageId": "",
+    "traceId": "trace-123",
+    "typeId": "s-crd-123"
+  },
+  "paymentReference": "",
+  "processing": {
+    "uniqueId": "31HA0xyz",
+    "shortId": "1234.1234.1234",
+    "3dsEci": "3DS_SUCCESS",
+    "traceId": "trace-123"
+  }
+}
\ No newline at end of file
diff --git a/test/integration/TransactionTypes/ScaTest.php b/test/integration/TransactionTypes/ScaTest.php
new file mode 100644
index 000000000..664967c6e
--- /dev/null
+++ b/test/integration/TransactionTypes/ScaTest.php
@@ -0,0 +1,189 @@
+<?php
+
+/** @noinspection PhpUnhandledExceptionInspection */
+/** @noinspection PhpDocMissingThrowsInspection */
+/**
+ * This class defines integration tests to verify SCA transactions in general.
+ *
+ * @link  https://docs.unzer.com/
+ *
+ */
+
+namespace UnzerSDK\test\integration\TransactionTypes;
+
+use UnzerSDK\Constants\RecurrenceTypes;
+use UnzerSDK\Resources\Metadata;
+use UnzerSDK\Resources\Payment;
+use UnzerSDK\Resources\PaymentTypes\Card;
+use UnzerSDK\Resources\TransactionTypes\Authorization;
+use UnzerSDK\Resources\TransactionTypes\Charge;
+use UnzerSDK\Resources\TransactionTypes\Sca;
+use UnzerSDK\test\BaseIntegrationTest;
+
+class ScaTest extends BaseIntegrationTest
+{
+    /**
+     * Verify SCA transaction can be performed using the id of a payment type.
+     *
+     * @test
+     */
+    public function scaShouldWorkWithTypeId(): Sca
+    {
+        /** @var Card $paymentType */
+        $paymentType = $this->unzer->createPaymentType($this->createCardObject());
+        $sca = new Sca(100.0, 'EUR', self::RETURN_URL);
+        $sca = $this->unzer->performSca($sca, $paymentType->getId());
+
+        $this->assertTransactionResourceHasBeenCreated($sca);
+        $this->assertInstanceOf(Payment::class, $sca->getPayment());
+        $this->assertNotEmpty($sca->getPayment()->getId());
+        $this->assertEquals(self::RETURN_URL, $sca->getReturnUrl());
+
+        return $sca;
+    }
+
+    /**
+     * Verify SCA transaction can be performed with payment type object.
+     *
+     * @test
+     */
+    public function scaShouldWorkWithTypeObject(): void
+    {
+        /** @var Card $paymentType */
+        $paymentType = $this->unzer->createPaymentType($this->createCardObject());
+        $sca = new Sca(100.0, 'EUR', self::RETURN_URL);
+        $sca = $this->unzer->performSca($sca, $paymentType);
+
+        $this->assertTransactionResourceHasBeenCreated($sca);
+        $this->assertInstanceOf(Payment::class, $sca->getPayment());
+        $this->assertNotEmpty($sca->getPayment()->getId());
+        $this->assertEquals(self::RETURN_URL, $sca->getReturnUrl());
+    }
+
+    /**
+     * Verify SCA transaction accepts all parameters.
+     *
+     * @test
+     */
+    public function scaShouldAcceptAllParameters(): Sca
+    {
+        // prepare test data
+        /** @var Card $paymentType */
+        $paymentType = $this->unzer->createPaymentType($this->createCardObject());
+        $customer = $this->getMinimalCustomer();
+        $metadata = (new Metadata())->addMetadata('key', 'value');
+        $basket = $this->createBasket();
+        $paymentReference = 'scaPaymentReference';
+
+        // perform request
+        $sca = new Sca(119.0, 'EUR', self::RETURN_URL);
+        $sca->setRecurrenceType(RecurrenceTypes::ONE_CLICK, $paymentType);
+        $sca->setPaymentReference($paymentReference);
+        $sca->setCard3ds(true);
+
+        $sca = $this->unzer->performSca($sca, $paymentType, $customer, $metadata, $basket);
+
+        // verify the data sent and received match
+        $payment = $sca->getPayment();
+        $this->assertSame($paymentType, $payment->getPaymentType());
+        $this->assertEquals(119.0, $sca->getAmount());
+        $this->assertEquals('EUR', $sca->getCurrency());
+        $this->assertEquals(self::RETURN_URL, $sca->getReturnUrl());
+        $this->assertSame($customer, $payment->getCustomer());
+        $this->assertSame($metadata, $payment->getMetadata());
+        $this->assertSame($basket, $payment->getBasket());
+        $this->assertEquals($paymentReference, $sca->getPaymentReference());
+    }
+
+    /**
+     * Verify SCA transaction can be fetched.
+     *
+     * @test
+     * @depends scaShouldWorkWithTypeId
+     */
+    public function scaTransactionCanBeFetched($sca): void
+    {
+        $this->assertTransactionResourceHasBeenCreated($sca);
+
+        // Fetch the SCA transaction
+        $fetchedSca = $this->unzer->fetchScaById($sca->getPaymentId(), $sca->getId());
+
+        // Verify the fetched transaction matches the initial transaction
+        $this->assertEquals($sca->getId(), $fetchedSca->getId());
+        $this->assertEquals($sca->getPaymentId(), $fetchedSca->getPaymentId());
+        $this->assertEquals($sca->getAmount(), $fetchedSca->getAmount());
+        $this->assertEquals($sca->getCurrency(), $fetchedSca->getCurrency());
+    }
+
+    /**
+     * Verify SCA transaction can be fetched using Sca object.
+     *
+     * @test
+     */
+    public function scaTransactionCanBeFetchedUsingSca(): void
+    {
+        // Create SCA transaction
+        /** @var Card $paymentType */
+        $paymentType = $this->unzer->createPaymentType($this->createCardObject());
+        $sca = new Sca(100.0, 'EUR', self::RETURN_URL);
+        $sca = $this->unzer->performSca($sca, $paymentType);
+
+        $this->assertTransactionResourceHasBeenCreated($sca);
+
+        // Fetch the SCA transaction using the Sca object
+        $fetchedSca = $this->unzer->fetchSca($sca);
+
+        // Verify the fetched transaction matches the initial transaction
+        $this->assertEquals($sca->getId(), $fetchedSca->getId());
+        $this->assertEquals($sca->getAmount(), $fetchedSca->getAmount());
+        $this->assertEquals($sca->getCurrency(), $fetchedSca->getCurrency());
+    }
+
+    /**
+     * Verify charge can be performed on SCA transaction.
+     *
+     * @test
+     */
+    public function chargeCanBePerformedOnScaTransaction(): void
+    {
+        // Create SCA transaction
+        /** @var Card $paymentType */
+        $paymentType = $this->unzer->createPaymentType($this->createCardObject());
+        $sca = new Sca(100.0, 'EUR', self::RETURN_URL);
+        $sca = $this->unzer->performSca($sca, $paymentType);
+
+        $this->assertTransactionResourceHasBeenCreated($sca);
+
+        // Perform charge on SCA transaction
+        $charge = $this->unzer->chargeScaTransaction($sca->getPayment(), $sca->getId(), 50.0);
+
+        $this->assertTransactionResourceHasBeenCreated($charge);
+        $this->assertInstanceOf(Charge::class, $charge);
+        $this->assertEquals(50.0, $charge->getAmount());
+        $this->assertEquals($sca->getPayment()->getId(), $charge->getPayment()->getId());
+    }
+
+    /**
+     * Verify authorize can be performed on SCA transaction.
+     *
+     * @test
+     */
+    public function authorizeCanBePerformedOnScaTransaction(): void
+    {
+        // Create SCA transaction
+        /** @var Card $paymentType */
+        $paymentType = $this->unzer->createPaymentType($this->createCardObject());
+        $sca = new Sca(100.0, 'EUR', self::RETURN_URL);
+        $sca = $this->unzer->performSca($sca, $paymentType);
+
+        $this->assertTransactionResourceHasBeenCreated($sca);
+
+        // Perform authorize on SCA transaction
+        $authorization = $this->unzer->authorizeScaTransaction($sca->getPayment(), $sca->getId(), 75.0);
+
+        $this->assertTransactionResourceHasBeenCreated($authorization);
+        $this->assertInstanceOf(Authorization::class, $authorization);
+        $this->assertEquals(75.0, $authorization->getAmount());
+        $this->assertEquals($sca->getPayment()->getId(), $authorization->getPayment()->getId());
+    }
+}
diff --git a/test/unit/Resources/TransactionTypes/ScaTest.php b/test/unit/Resources/TransactionTypes/ScaTest.php
new file mode 100644
index 000000000..b587880c3
--- /dev/null
+++ b/test/unit/Resources/TransactionTypes/ScaTest.php
@@ -0,0 +1,42 @@
+<?php
+
+/** @noinspection PhpUnhandledExceptionInspection */
+/** @noinspection PhpDocMissingThrowsInspection */
+/**
+ * This class defines unit tests to verify functionality of the SCA transaction type.
+ *
+ * @link  https://docs.unzer.com/
+ *
+ */
+
+namespace UnzerSDK\test\unit\Resources\TransactionTypes;
+
+use UnzerSDK\Resources\TransactionTypes\Sca;
+use UnzerSDK\test\BasePaymentTest;
+
+class ScaTest extends BasePaymentTest
+{
+    /**
+     * @test
+     */
+    public function constructorTest()
+    {
+        $sca = new Sca(99.99, "EUR", "https://return-url.com");
+        $this->assertEquals(99.99, $sca->getAmount());
+        $this->assertEquals("EUR", $sca->getCurrency());
+        $this->assertEquals("https://return-url.com", $sca->getReturnUrl());
+    }
+
+    /**
+     * @test
+     */
+    public function getterSetterTest()
+    {
+        $sca = new Sca(99.99, "EUR", "https://return-url.com");
+        $sca->setPaymentReference('reference')
+            ->setCard3ds(false);
+        $this->assertEquals(99.99, $sca->getAmount());
+        $this->assertEquals("EUR", $sca->getCurrency());
+        $this->assertEquals("https://return-url.com", $sca->getReturnUrl());
+    }
+}
diff --git a/test/unit/Services/ResourceServiceTest.php b/test/unit/Services/ResourceServiceTest.php
index 1bcc7086b..6cb6de5cd 100755
--- a/test/unit/Services/ResourceServiceTest.php
+++ b/test/unit/Services/ResourceServiceTest.php
@@ -1391,7 +1391,8 @@ public function fetchResourceByUrlShouldFetchTheDesiredResourceDP(): array
             'v2Customer' => ['fetchCustomer', ['s-cst-123e4567-e89b-12d3-a456-426614174000'], 'https://api.unzer.com/v2/customers/s-cst-123e4567-e89b-12d3-a456-426614174000'],
             'v1Basket' => ['fetchBasket', ['s-bsk-1254'], 'https://api.unzer.com/v1/baskets/s-bsk-1254/'],
             'v2Basket' => ['fetchBasket', ['s-bsk-1254'], 'https://api.unzer.com/v2/baskets/s-bsk-1254/'],
-            'Payout' => ['fetchPayout', ['s-pay-100746'], 'https://api.unzer.com/v1/payments/s-pay-100746/payout/s-out-1/']
+            'Payout' => ['fetchPayout', ['s-pay-100746'], 'https://api.unzer.com/v1/payments/s-pay-100746/payout/s-out-1/'],
+            'Sca' => ['fetchScaById', ['s-pay-100746', 's-sca-1'], 'https://api.unzer.com/v1/payments/s-pay-100746/sca/s-sca-1/']
         ];
     }