diff --git a/composer.json b/composer.json
index 2c38a14b..615b69a5 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,8 @@
     "symfony/console": ">=6.0",
     "setasign/fpdf": "^1.8",
     "setasign/fpdi": "^2.6.4",
-    "smalot/pdfparser": "^2.12"
+    "smalot/pdfparser": "^2.12",
+    "composer/ca-bundle": "^1.5"
   },
   "require-dev": {
     "friendsofphp/php-cs-fixer": "^3.38",
diff --git a/src/CustomSleepMixin.php b/src/CustomSleepMixin.php
index bb4203c8..8ef468a2 100644
--- a/src/CustomSleepMixin.php
+++ b/src/CustomSleepMixin.php
@@ -4,26 +4,37 @@
 
 namespace Mindee;
 
+use Mindee\Error\MindeeException;
+use Mindee\Http\CancellationToken;
+
 trait CustomSleepMixin
 {
     /**
      * Waits for a custom amount of time from either a float or an integer.
-     * Purposefully waits for one more millisecond on windows due to flakiness in delays between OS.
+     * Purposefully waits for one more millisecond on Windows due to flakiness in delays between OS.
      * @param float|integer $delay Delay in seconds.
+     * @param CancellationToken|null $cancellationToken CancellationToken to check for cancellation.
      */
-    protected static function customSleep(float|int $delay): void
+    protected static function customSleep(float|int $delay, ?CancellationToken $cancellationToken = null): void
     {
         if ($delay <= 0) {
             return;
         }
-
-        $seconds = (int) $delay;
-        $nanoseconds = abs($seconds - (float) $delay);
-        if (
-            strtoupper(substr(PHP_OS_FAMILY, 0, 7)) === 'WINDOWS'
-        ) {
+        $endTime = microtime(true) + $delay;
+        $pollIntervalMicroseconds = 100_000;
+        while (microtime(true) < $endTime) {
+            if ($cancellationToken && $cancellationToken->isCancelled()) {
+                throw new MindeeException("Polling operation was cancelled.");
+            }
+            $remainingSeconds = $endTime - microtime(true);
+            if ($remainingSeconds <= 0) {
+                break;
+            }
+            $sleepMicroseconds = (int) min($pollIntervalMicroseconds, $remainingSeconds * 1_000_000);
+            usleep($sleepMicroseconds);
+        }
+        if (PHP_OS_FAMILY === 'Windows') {
             usleep(1000);
         }
-        time_nanosleep($seconds, (int) ($nanoseconds * 1_000_000_000));
     }
 }
diff --git a/src/Http/CancellationToken.php b/src/Http/CancellationToken.php
new file mode 100644
index 00000000..cb41ff3c
--- /dev/null
+++ b/src/Http/CancellationToken.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Mindee\Http;
+
+/**
+ * Custom Mindee HTTP cancellation token for polling.
+ */
+class CancellationToken
+{
+    private bool $isCanceled = false;
+
+    /**
+     * Flags the token as canceled.
+     */
+    public function cancel(): void
+    {
+        $this->isCanceled = true;
+    }
+
+    /**
+     * Checks whether the token is canceled.
+     * @return boolean whether the token is canceled.
+     */
+    public function isCanceled(): bool
+    {
+        return $this->isCanceled;
+    }
+
+    /**
+     * Checks whether the token is canceled, but in British.
+     * @return boolean whether the token is canceled.
+     */
+    public function isCancelled(): bool
+    {
+        return $this->isCanceled;
+    }
+}
diff --git a/src/Http/CurlSslConfig.php b/src/Http/CurlSslConfig.php
new file mode 100644
index 00000000..64d17f36
--- /dev/null
+++ b/src/Http/CurlSslConfig.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Mindee\Http;
+
+use Composer\CaBundle\CaBundle;
+use CurlHandle;
+
+/**
+ * Configures TLS certificate verification for cURL handles.
+ */
+class CurlSslConfig
+{
+    /**
+     * Enables peer verification and points cURL at a valid CA bundle.
+     *
+     * Uses the CA bundle detected by composer/ca-bundle (system store or the
+     * bundled Mozilla CA set as a fallback), so verification works reliably
+     * across OSes and PHP builds that ship without a configured CA file.
+     *
+     * @param CurlHandle $ch cURL handle to configure.
+     */
+    public static function apply(CurlHandle $ch): void
+    {
+        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
+        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
+
+        $caPathOrFile = CaBundle::getSystemCaRootBundlePath();
+        if (is_dir($caPathOrFile) || (is_link($caPathOrFile) && is_dir((string) readlink($caPathOrFile)))) {
+            curl_setopt($ch, CURLOPT_CAPATH, $caPathOrFile);
+        } else {
+            curl_setopt($ch, CURLOPT_CAINFO, $caPathOrFile);
+        }
+    }
+}
diff --git a/src/V1/Client.php b/src/V1/Client.php
index a5fdc433..b2e81df2 100644
--- a/src/V1/Client.php
+++ b/src/V1/Client.php
@@ -16,6 +16,7 @@
 use Mindee\Error\ErrorCode;
 use Mindee\Error\MindeeApiException;
 use Mindee\Error\MindeeException;
+use Mindee\Http\CancellationToken;
 use Mindee\Input\InputSource;
 use Mindee\Input\LocalInputSource;
 use Mindee\Input\LocalResponse;
@@ -349,6 +350,7 @@ public function parse(
      * @param PredictMethodOptions|null $options Prediction Options.
      * @param PollingOptions|null $asyncOptions Async Options. Manages timers.
      * @param PageOptions|null $pageOptions Options to apply to the PDF file.
+     * @param CancellationToken|null $cancellationToken CancellationToken to check for cancellation.
      * @throws MindeeApiException Throws if the document couldn't be retrieved in time.
      */
     public function enqueueAndParse(
@@ -356,7 +358,8 @@ public function enqueueAndParse(
         InputSource $inputDoc,
         ?PredictMethodOptions $options = null,
         ?PollingOptions $asyncOptions = null,
-        ?PageOptions $pageOptions = null
+        ?PageOptions $pageOptions = null,
+        ?CancellationToken $cancellationToken = null,
     ): AsyncPredictResponse {
         if (null === $options) {
             $options = new PredictMethodOptions();
@@ -377,7 +380,7 @@ public function enqueueAndParse(
         );
         error_log("Successfully enqueued document with job id: " . $enqueueResponse->job->id);
 
-        $this->customSleep($asyncOptions->initialDelaySec);
+        $this->customSleep($asyncOptions->initialDelaySec, $cancellationToken);
         $retryCounter = 1;
         $pollResults = $this->parseQueued($predictionType, $enqueueResponse->job->id, $options->endpoint);
 
diff --git a/src/V1/Http/BaseEndpoint.php b/src/V1/Http/BaseEndpoint.php
index da2b61d6..570ff2d0 100644
--- a/src/V1/Http/BaseEndpoint.php
+++ b/src/V1/Http/BaseEndpoint.php
@@ -5,6 +5,7 @@
 namespace Mindee\V1\Http;
 
 use CurlHandle;
+use Mindee\Http\CurlSslConfig;
 
 /**
  * Abstract class for endpoints.
@@ -38,7 +39,7 @@ protected function initCurlSessionGet(string $queueId): array
         curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
         curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $this->settings->requestTimeout);
         curl_setopt($ch, CURLOPT_HTTPGET, true);
-        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
+        CurlSslConfig::apply($ch);
         curl_setopt($ch, CURLOPT_USERAGENT, getUserAgent());
 
         $resp = [
@@ -72,7 +73,7 @@ public function setFinalCurlOpts(
         if ($postFields !== null) {
             curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields);
         }
-        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
+        CurlSslConfig::apply($ch);
         curl_setopt($ch, CURLOPT_USERAGENT, getUserAgent());
         $resp = [
             'data' => curl_exec($ch),
diff --git a/src/V2/Client.php b/src/V2/Client.php
index 25de2e47..9997a827 100644
--- a/src/V2/Client.php
+++ b/src/V2/Client.php
@@ -7,6 +7,7 @@
 use Mindee\ClientOptions\PollingOptions;
 use Mindee\CustomSleepMixin;
 use Mindee\Error\MindeeException;
+use Mindee\Http\CancellationToken;
 use Mindee\Input\InputSource;
 use Mindee\V2\ClientOptions\BaseParameters;
 use Mindee\V2\Http\MindeeApiV2;
@@ -45,7 +46,7 @@ public function __construct(?string $apiKey = null)
      * @category Asynchronous
      */
     public function enqueue(
-        InputSource $inputSource,
+        InputSource    $inputSource,
         BaseParameters $params
     ): JobResponse {
         return $this->mindeeApi->reqPostEnqueue($inputSource, $params);
@@ -103,14 +104,16 @@ public function getJob(string $jobId): JobResponse
      * @param InputSource $inputDoc Input document to parse.
      * @param BaseParameters $params Parameters relating to prediction options.
      * @param PollingOptions|null $pollingOptions Options to apply to the polling.
+     * @param CancellationToken|null $cancellationToken CancellationToken to check for cancellation.
      * @return BaseResponse A response containing parsing results.
      * @throws MindeeException Throws if enqueueing fails, job fails, or times out.
      */
     public function enqueueAndGetResult(
-        string $responseClass,
-        InputSource $inputDoc,
-        BaseParameters $params,
-        ?PollingOptions $pollingOptions = null
+        string             $responseClass,
+        InputSource        $inputDoc,
+        BaseParameters     $params,
+        ?PollingOptions    $pollingOptions = null,
+        ?CancellationToken $cancellationToken = null
     ): BaseResponse {
         if (!$pollingOptions) {
             $pollingOptions = new PollingOptions();
@@ -126,7 +129,7 @@ public function enqueueAndGetResult(
         $jobId = $enqueueResponse->job->id;
         error_log("Successfully enqueued document with job ID: " . $jobId);
 
-        $this->customSleep($pollingOptions->initialDelaySec);
+        $this->customSleep($pollingOptions->initialDelaySec, $cancellationToken);
         $retryCounter = 1;
         $pollResults = $this->getJob($jobId);
 
@@ -144,7 +147,7 @@ public function enqueueAndGetResult(
                 . ". Job status: " . $pollResults->job->status
             );
 
-            $this->customSleep($pollingOptions->delaySec);
+            $this->customSleep($pollingOptions->delaySec, $cancellationToken);
             $pollResults = $this->getJob($jobId);
             $retryCounter++;
         }
diff --git a/src/V2/Http/MindeeApiV2.php b/src/V2/Http/MindeeApiV2.php
index b1efefc4..6835c1b9 100644
--- a/src/V2/Http/MindeeApiV2.php
+++ b/src/V2/Http/MindeeApiV2.php
@@ -13,6 +13,7 @@
 use Mindee\Error\ErrorCode;
 use Mindee\Error\MindeeApiException;
 use Mindee\Error\MindeeException;
+use Mindee\Http\CurlSslConfig;
 use Mindee\Input\InputSource;
 use Mindee\Input\LocalInputSource;
 use Mindee\Input\UrlInputSource;
@@ -306,7 +307,7 @@ private function initChannel(): bool|CurlHandle
         curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
         curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $this->requestTimeout);
-        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
+        CurlSslConfig::apply($ch);
 
         curl_setopt($ch, CURLOPT_USERAGENT, $this->getUserAgent());
         return $ch;