diff --git a/src/Message/AbstractRequest.php b/src/Message/AbstractRequest.php
index 159c1da..93465fb 100755
--- a/src/Message/AbstractRequest.php
+++ b/src/Message/AbstractRequest.php
@@ -76,19 +76,31 @@ protected function getResponseBody(): array
     /**
      * Safety hash from icepay, to be generated after putting in all the data.
      *
-     * @param string $requestMethod
-     * @param string $urlPath
-     * @param array  $data
+     * @param string          $requestMethod
+     * @param string          $urlPath
+     * @param array|\stdClass $data
+     * @param bool            $urlIsFullUrl  = false. True to have $urlPath be the absolute (full) url
      *
      * @return string
      */
-    private function getSecurityHash(string $requestMethod, string $urlPath, array $data): string
-    {
-        $string = $this->getBaseUrl().$urlPath.$requestMethod.$this->getContractProfileId().json_encode($data);
+    protected function getSecurityHash(
+        string $requestMethod,
+        string $urlPath,
+        $data,
+        bool $urlIsFullUrl = false
+    ): string {
+        $contractProfileId = $this->getContractProfileId();
+
+        $fullUrl = $this->getBaseUrl().$urlPath;
+        if ($urlIsFullUrl) {
+            $fullUrl = $urlPath;
+        }
+
+        $toBeHashed = $fullUrl.$requestMethod.$contractProfileId.json_encode($data);
 
         $hash = hash_hmac(
             'sha256',
-            $string,
+            $toBeHashed,
             base64_decode($this->getSecretKey()),
             true
         );
diff --git a/src/Message/TransactionStatusRequest.php b/src/Message/TransactionStatusRequest.php
index ff1eb65..ef28af1 100755
--- a/src/Message/TransactionStatusRequest.php
+++ b/src/Message/TransactionStatusRequest.php
@@ -27,6 +27,12 @@ public function getData(): array
      */
     public function sendData($data): ResponseInterface
     {
+        $transactionStatusResponse = $this->getTransactionStatusFromPostBack();
+
+        if ($transactionStatusResponse !== null) {
+            return $transactionStatusResponse;
+        }
+
         $this->sendRequest(
             Request::METHOD_POST,
             sprintf(
@@ -42,4 +48,101 @@ public function sendData($data): ResponseInterface
             $this->getResponse()->getStatusCode()
         );
     }
+
+    /**
+     * Use the data sent by Icepay in the post back to check the status.
+     * This is necessary because Icepay has a delay in their backend if you request the status immediately after the signal.
+     *
+     * @see http://docs2.icepay.com/payment-process/handling-the-postback/postback-sample/
+     *
+     * @return TransactionStatusResponse|null - Null when the data is is not sent or not correct
+     */
+    private function getTransactionStatusFromPostBack(): ?TransactionStatusResponse
+    {
+        if (stripos($this->httpRequest->getContentType(), 'json') === false) {
+            return null;
+        }
+
+        try {
+            $content = $this->httpRequest->getContent();
+            $contentAsArray = json_decode($content, true);
+            $contentAsStdObj = json_decode($content);
+        } catch (\LogicException $exception) {
+            return null;
+        }
+
+        if (is_array($contentAsArray) === false || isset($contentAsArray['StatusCode']) === false) {
+            return null;
+        }
+
+        $this->setContractProfileId($contentAsStdObj->ContractProfileId);
+
+        if ($this->validateSecurityHashMatch($this->httpRequest, $contentAsStdObj) === false) {
+            return null;
+        }
+
+        $camelCasedKeysContent = array_combine(
+            array_map('lcfirst', array_keys($contentAsArray)),
+            array_values($contentAsArray)
+        );
+
+        return new TransactionStatusResponse(
+            $this,
+            $camelCasedKeysContent,
+            200
+        );
+    }
+
+    /**
+     * Get the security hash from the request and match it against a generated hash from the sent values.
+     * Needs the POSTed JSON as stdClass.
+     *
+     * @param Request   $request
+     * @param \stdClass $contentAsStdObj
+     *
+     * @return bool
+     */
+    private function validateSecurityHashMatch(Request $request, \stdClass $contentAsStdObj): bool
+    {
+        $sentSecurityHash = $request->headers->get('checksum');
+
+        $possibleHashes = $this->getPossibleValidHashes($request, $contentAsStdObj);
+
+        foreach ($possibleHashes as $generatedHash) {
+            if ($generatedHash === $sentSecurityHash) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * They way Icepay generates the hash is by using our notification url.
+     * Though, they might add a trailing slash. Unsure of this at this point, so check both.
+     *
+     * @param Request   $request
+     * @param \stdClass $contentAsStdObj
+     *
+     * @return array
+     */
+    private function getPossibleValidHashes(Request $request, $contentAsStdObj): array
+    {
+        $notifyUrls = [
+            $request->getSchemeAndHttpHost().$request->getRequestUri(),
+            $request->getSchemeAndHttpHost().$request->getRequestUri().'/',
+        ];
+
+        $hashes = [];
+        foreach ($notifyUrls as $notifyUrl) {
+            $hashes[] = $this->getSecurityHash(
+                $request->getMethod(),
+                $notifyUrl,
+                $contentAsStdObj,
+                true
+            );
+        }
+
+        return $hashes;
+    }
 }