diff --git a/src/Exception/BadRequestApiException.php b/src/Exception/BadRequestApiException.php
new file mode 100644
index 0000000..a89fe28
--- /dev/null
+++ b/src/Exception/BadRequestApiException.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ThePay\ApiClient\Exception;
+
+final class BadRequestApiException extends \RuntimeException implements ApiExceptionInterface
+{
+}
diff --git a/src/Exception/ConflictApiException.php b/src/Exception/ConflictApiException.php
new file mode 100644
index 0000000..1e6760e
--- /dev/null
+++ b/src/Exception/ConflictApiException.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ThePay\ApiClient\Exception;
+
+final class ConflictApiException extends \RuntimeException implements ApiExceptionInterface
+{
+}
diff --git a/src/Exception/ForbiddenApiException.php b/src/Exception/ForbiddenApiException.php
new file mode 100644
index 0000000..5db56d3
--- /dev/null
+++ b/src/Exception/ForbiddenApiException.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ThePay\ApiClient\Exception;
+
+final class ForbiddenApiException extends \RuntimeException implements ApiExceptionInterface
+{
+}
diff --git a/src/Exception/MissingExtensionException.php b/src/Exception/MissingExtensionException.php
index 097eca3..7580100 100644
--- a/src/Exception/MissingExtensionException.php
+++ b/src/Exception/MissingExtensionException.php
@@ -4,6 +4,11 @@
 
 use Exception;
 
+/**
+ * @deprecated no longer thrown
+ *
+ * @todo breaking change: remove it
+ */
 class MissingExtensionException extends Exception
 {
 }
diff --git a/src/Exception/NoAvailablePaymentMethod.php b/src/Exception/NoAvailablePaymentMethod.php
index 0a92c8a..14f5522 100644
--- a/src/Exception/NoAvailablePaymentMethod.php
+++ b/src/Exception/NoAvailablePaymentMethod.php
@@ -4,6 +4,11 @@
 
 use Exception;
 
+/**
+ * @deprecated no longer thrown
+ *
+ * @todo breaking change: remove it
+ */
 class NoAvailablePaymentMethod extends Exception
 {
 }
diff --git a/src/Exception/TooManyRequestsApiException.php b/src/Exception/TooManyRequestsApiException.php
new file mode 100644
index 0000000..b39b092
--- /dev/null
+++ b/src/Exception/TooManyRequestsApiException.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ThePay\ApiClient\Exception;
+
+final class TooManyRequestsApiException extends \RuntimeException implements ApiExceptionInterface
+{
+}
diff --git a/src/Exception/UnauthorizedApiException.php b/src/Exception/UnauthorizedApiException.php
new file mode 100644
index 0000000..bde6ffb
--- /dev/null
+++ b/src/Exception/UnauthorizedApiException.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ThePay\ApiClient\Exception;
+
+final class UnauthorizedApiException extends \RuntimeException implements ApiExceptionInterface
+{
+}
diff --git a/src/Exception/UnprocessableContentApiException.php b/src/Exception/UnprocessableContentApiException.php
new file mode 100644
index 0000000..a7e47b8
--- /dev/null
+++ b/src/Exception/UnprocessableContentApiException.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ThePay\ApiClient\Exception;
+
+final class UnprocessableContentApiException extends \RuntimeException implements ApiExceptionInterface
+{
+}
diff --git a/src/Service/ApiService.php b/src/Service/ApiService.php
index b5447e5..eaca395 100644
--- a/src/Service/ApiService.php
+++ b/src/Service/ApiService.php
@@ -8,8 +8,14 @@
 use Psr\Http\Message\StreamFactoryInterface;
 use Psr\Http\Message\StreamInterface;
 use ThePay\ApiClient\Exception\ApiExceptionInterface;
+use ThePay\ApiClient\Exception\BadRequestApiException;
+use ThePay\ApiClient\Exception\ConflictApiException;
+use ThePay\ApiClient\Exception\ForbiddenApiException;
 use ThePay\ApiClient\Exception\NotFoundApiException;
 use ThePay\ApiClient\Exception\ServiceUnavailableApiException;
+use ThePay\ApiClient\Exception\TooManyRequestsApiException;
+use ThePay\ApiClient\Exception\UnauthorizedApiException;
+use ThePay\ApiClient\Exception\UnprocessableContentApiException;
 use ThePay\ApiClient\Filter\PaymentsFilter;
 use ThePay\ApiClient\Filter\TransactionFilter;
 use ThePay\ApiClient\Model\AccountBalance;
@@ -483,8 +489,20 @@ private function buildException(string $requestUrl, ResponseInterface $response)
         $message .= $this->getErrorResponseMessage($response->getBody()->getContents());
 
         switch (true) {
+            case $responseCode == 400:
+                return new BadRequestApiException($message, $responseCode);
+            case $responseCode == 401:
+                return new UnauthorizedApiException($message, $responseCode);
+            case $responseCode == 403:
+                return new ForbiddenApiException($message, $responseCode);
             case $responseCode == 404:
                 return new NotFoundApiException($message, $responseCode);
+            case $responseCode == 409:
+                return new ConflictApiException($message, $responseCode);
+            case $responseCode == 422:
+                return new UnprocessableContentApiException($message, $responseCode);
+            case $responseCode == 429:
+                return new TooManyRequestsApiException($message, $responseCode);
             case $responseCode >= 500:
             case $responseCode == 0: // network communication failure
                 return new ServiceUnavailableApiException($message, $responseCode);
diff --git a/src/Service/ApiServiceInterface.php b/src/Service/ApiServiceInterface.php
index 9bb2b2f..b69a03a 100644
--- a/src/Service/ApiServiceInterface.php
+++ b/src/Service/ApiServiceInterface.php
@@ -4,7 +4,9 @@
 
 use Psr\Http\Message\StreamInterface;
 use ThePay\ApiClient\Exception\ApiExceptionInterface;
+use ThePay\ApiClient\Exception\ConflictApiException;
 use ThePay\ApiClient\Exception\NotFoundApiException;
+use ThePay\ApiClient\Exception\UnprocessableContentApiException;
 use ThePay\ApiClient\Filter\PaymentsFilter;
 use ThePay\ApiClient\Filter\TransactionFilter;
 use ThePay\ApiClient\Model\AccountBalance;
@@ -30,6 +32,9 @@
 use ThePay\ApiClient\ValueObject\LanguageCode;
 use ThePay\ApiClient\ValueObject\StringValue;
 
+/**
+ * @note List only exceptions meant for flow control in `@throws`, all other errors should be covered by {@see ApiExceptionInterface}.
+ */
 interface ApiServiceInterface
 {
     /**
@@ -171,7 +176,7 @@ public function getAccountStatementGPC(TransactionFilter $filter, ?GPCPaymentIde
      *
      * @param non-empty-string|null $methodCode
      *
-     * @throws ApiExceptionInterface
+     * @throws ConflictApiException|ApiExceptionInterface
      */
     public function createPayment(CreatePaymentParams $createPaymentParams, ?string $methodCode = null): CreatePaymentResponse;
 
@@ -180,7 +185,7 @@ public function createPayment(CreatePaymentParams $createPaymentParams, ?string
      *
      * @see https://docs.thepay.eu/#tag/Preauthorized-Payments/paths/~1v2~1projects~1%7Bproject_id%7D~1payments~1%7Bpayment_uid%7D~1preauthorized/post
      *
-     * @throws NotFoundApiException|ApiExceptionInterface
+     * @throws NotFoundApiException|UnprocessableContentApiException|ApiExceptionInterface
      */
     public function realizePreauthorizedPayment(RealizePreauthorizedPaymentParams $params): RealizePreauthorizedPaymentResult;
 
@@ -189,7 +194,7 @@ public function realizePreauthorizedPayment(RealizePreauthorizedPaymentParams $p
      *
      * @see https://docs.thepay.eu/#tag/Preauthorized-Payments/paths/~1v1~1projects~1%7Bproject_id%7D~1payments~1%7Bpayment_uid%7D~1preauthorized/delete
      *
-     * @throws NotFoundApiException|ApiExceptionInterface
+     * @throws NotFoundApiException|UnprocessableContentApiException|ApiExceptionInterface
      */
     public function cancelPreauthorizedPayment(Identifier $uid): void;
 
diff --git a/src/TheClient.php b/src/TheClient.php
index 5283360..4edca2f 100644
--- a/src/TheClient.php
+++ b/src/TheClient.php
@@ -5,7 +5,9 @@
 use InvalidArgumentException;
 use Psr\Http\Message\StreamInterface;
 use ThePay\ApiClient\Exception\ApiExceptionInterface;
+use ThePay\ApiClient\Exception\ConflictApiException;
 use ThePay\ApiClient\Exception\NotFoundApiException;
+use ThePay\ApiClient\Exception\UnprocessableContentApiException;
 use ThePay\ApiClient\Filter\PaymentMethodFilter;
 use ThePay\ApiClient\Filter\PaymentsFilter;
 use ThePay\ApiClient\Filter\TransactionFilter;
@@ -295,7 +297,7 @@ public function getPaymentButtonsForPayment($uid, $languageCode = null, $useInli
     /**
      * @param non-empty-string|null $methodCode
      *
-     * @throws ApiExceptionInterface
+     * @throws ConflictApiException|ApiExceptionInterface
      */
     public function createPayment(CreatePaymentParams $params, ?string $methodCode = null): CreatePaymentResponse
     {
@@ -327,7 +329,7 @@ public function changePaymentMethod(string $paymentUid, string $methodCode): voi
      *
      * @return RealizePreauthorizedPaymentResult
      *
-     * @throws InvalidArgumentException|NotFoundApiException|ApiExceptionInterface
+     * @throws InvalidArgumentException|NotFoundApiException|UnprocessableContentApiException|ApiExceptionInterface
      */
     public function realizePreauthorizedPayment(RealizePreauthorizedPaymentParams $params): RealizePreauthorizedPaymentResult
     {
@@ -340,7 +342,7 @@ public function realizePreauthorizedPayment(RealizePreauthorizedPaymentParams $p
     /**
      * @param non-empty-string $paymentUid
      *
-     * @throws InvalidArgumentException|NotFoundApiException|ApiExceptionInterface
+     * @throws InvalidArgumentException|NotFoundApiException|UnprocessableContentApiException|ApiExceptionInterface
      */
     public function cancelPreauthorizedPayment(string $paymentUid): void
     {
@@ -392,7 +394,7 @@ public function createPaymentRefund($paymentUid, $amount, $reason)
      *
      * @return string with binary content of PDF file
      *
-     * @throws NotFoundApiException|ApiExceptionInterface if payment is not paid yet
+     * @throws InvalidArgumentException|NotFoundApiException|ApiExceptionInterface if payment is not paid yet
      */
     public function generatePaymentConfirmationPdf(string $paymentUid, ?string $languageCode = null): string
     {