diff --git a/CHANGELOG.md b/CHANGELOG.md
index a3c0755..de2ca12 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 - Add `IdentifyScenarioVersion.restrictedCountries`
 - Add `EnvelopeTemplateDocumentAssignments` endpoint
 - Add `Envelope.createdBy` and `Envelope.sentBy`
+- Add `BatchSendings` and `BatchSendingsItems` endpoints
 
 ## [2.4.0] - 2024-05-14
 ### Added
diff --git a/src/DigiSign.php b/src/DigiSign.php
index 43da060..7f1adff 100644
--- a/src/DigiSign.php
+++ b/src/DigiSign.php
@@ -9,6 +9,7 @@
 use DigitalCz\DigiSign\Auth\Credentials;
 use DigitalCz\DigiSign\Endpoint\AccountEndpoint;
 use DigitalCz\DigiSign\Endpoint\AuthEndpoint;
+use DigitalCz\DigiSign\Endpoint\BatchSendingsEndpoint;
 use DigitalCz\DigiSign\Endpoint\DeliveriesEndpoint;
 use DigitalCz\DigiSign\Endpoint\EndpointInterface;
 use DigitalCz\DigiSign\Endpoint\EnumsEndpoint;
@@ -128,8 +129,8 @@ public function validateSignature(string $payload, string $header, string $secre
             throw new InvalidSignatureException('Unable to parse signature header');
         }
 
-        $ts = (int)($matches['t'] ?? 0);
-        $signature = $matches['s'] ?? '';
+        $ts = (int)($matches['t']);
+        $signature = $matches['s'];
 
         if ($ts < time() - $this->signatureTolerance) {
             throw new InvalidSignatureException("Request is older than {$this->signatureTolerance} seconds");
@@ -243,6 +244,11 @@ public function deliveries(): DeliveriesEndpoint
         return new DeliveriesEndpoint($this);
     }
 
+    public function batchSendings(): BatchSendingsEndpoint
+    {
+        return new BatchSendingsEndpoint($this);
+    }
+
     public function identifications(): IdentificationsEndpoint
     {
         return new IdentificationsEndpoint($this);
diff --git a/src/Endpoint/BatchSendingsEndpoint.php b/src/Endpoint/BatchSendingsEndpoint.php
new file mode 100644
index 0000000..f325b4d
--- /dev/null
+++ b/src/Endpoint/BatchSendingsEndpoint.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DigitalCz\DigiSign\Endpoint;
+
+use DigitalCz\DigiSign\DigiSign;
+use DigitalCz\DigiSign\Endpoint\Traits\CreateEndpointTrait;
+use DigitalCz\DigiSign\Endpoint\Traits\GetEndpointTrait;
+use DigitalCz\DigiSign\Endpoint\Traits\UpdateEndpointTrait;
+use DigitalCz\DigiSign\Resource\BatchSending;
+
+/**
+ * @extends ResourceEndpoint<BatchSending>
+ * @method BatchSending get(string $id)
+ * @method BatchSending update(string $id, array $body)
+ * @method BatchSending create(array $body)
+ */
+final class BatchSendingsEndpoint extends ResourceEndpoint
+{
+    use GetEndpointTrait;
+    use UpdateEndpointTrait;
+    use CreateEndpointTrait;
+
+    public function __construct(DigiSign $parent)
+    {
+        parent::__construct($parent, '/api/batch-sendings');
+    }
+
+    public function items(string $id): BatchSendingsItemsEndpoint
+    {
+        return new BatchSendingsItemsEndpoint($this, $id);
+    }
+}
diff --git a/src/Endpoint/BatchSendingsItemsEndpoint.php b/src/Endpoint/BatchSendingsItemsEndpoint.php
new file mode 100644
index 0000000..0d9ca54
--- /dev/null
+++ b/src/Endpoint/BatchSendingsItemsEndpoint.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DigitalCz\DigiSign\Endpoint;
+
+use DigitalCz\DigiSign\Resource\BaseResource;
+
+/**
+ * @extends ResourceEndpoint<BaseResource>
+ */
+final class BatchSendingsItemsEndpoint extends ResourceEndpoint
+{
+    public function __construct(BatchSendingsEndpoint $parent, string $batchSending)
+    {
+        parent::__construct($parent, '/{id}/items', BaseResource::class, ['id' => $batchSending]);
+    }
+
+    /**
+     * @param mixed[] $body
+     */
+    public function import(array $body): BaseResource
+    {
+        return $this->createResource($this->postRequest('/import', ['json' => $body]));
+    }
+}
diff --git a/src/Resource/BaseResource.php b/src/Resource/BaseResource.php
index b6c1138..05c0d80 100644
--- a/src/Resource/BaseResource.php
+++ b/src/Resource/BaseResource.php
@@ -161,7 +161,7 @@ protected function setProperty(string $property, mixed $value): void
                 // parse Resource class from type
                 preg_match('/Collection<(.+)>/', $type, $matches);
                 /** @var class-string<ResourceInterface> $resourceClass */
-                $resourceClass = $matches[1];
+                $resourceClass = $matches[1] ?? '';
 
                 if (!class_exists($resourceClass)) {
                     $reflection = new ReflectionClass($this::class);
diff --git a/src/Resource/BatchSending.php b/src/Resource/BatchSending.php
new file mode 100644
index 0000000..be966b7
--- /dev/null
+++ b/src/Resource/BatchSending.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DigitalCz\DigiSign\Resource;
+
+use DigitalCz\DigiSign\Resource\Traits\EntityResourceTrait;
+
+class BatchSending extends BaseResource
+{
+    use EntityResourceTrait;
+
+    public string $id;
+
+    public ?string $name;
+
+    public ?string $envelopeTemplateId;
+
+    public int $itemsWaitingCount;
+
+    public int $itemsSuccessCount;
+
+    public int $itemsFailedCount;
+
+    public int $itemsTotalCount;
+
+    public string $status;
+
+    /**
+     * @var array<string>
+     */
+    public array $importFields;
+}
diff --git a/tests/DigiSignTest.php b/tests/DigiSignTest.php
index 4419fd2..05d1508 100644
--- a/tests/DigiSignTest.php
+++ b/tests/DigiSignTest.php
@@ -134,6 +134,8 @@ public function testChildren(): void
         self::assertSame('/api/auth-token', $mockClient->getLastRequest()->getUri()->getPath());
         $dgs->account()->request('GET');
         self::assertSame('/api/account', $mockClient->getLastRequest()->getUri()->getPath());
+        $dgs->batchSendings()->request('GET');
+        self::assertSame('/api/batch-sendings', $mockClient->getLastRequest()->getUri()->getPath());
         $dgs->envelopes()->request('GET');
         self::assertSame('/api/envelopes', $mockClient->getLastRequest()->getUri()->getPath());
         $dgs->envelopeTemplates()->request('GET');
diff --git a/tests/Endpoint/BatchSendingEndpointTest.php b/tests/Endpoint/BatchSendingEndpointTest.php
new file mode 100644
index 0000000..a8537eb
--- /dev/null
+++ b/tests/Endpoint/BatchSendingEndpointTest.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DigitalCz\DigiSign\Endpoint;
+
+/**
+ * @covers \DigitalCz\DigiSign\Endpoint\BatchSendingsEndpoint
+ */
+class BatchSendingEndpointTest extends EndpointTestCase
+{
+    public function testChildren(): void
+    {
+        self::assertDefaultEndpointPath(self::endpoint()->items('foo'), '/api/batch-sendings/foo/items');
+    }
+
+    public function testCRUD(): void
+    {
+        self::endpoint()->get('foo');
+        self::assertLastRequest('GET', "/api/batch-sendings/foo");
+
+        self::endpoint()->create([]);
+        self::assertLastRequest('POST', "/api/batch-sendings");
+
+        self::endpoint()->update('foo', []);
+        self::assertLastRequest('PUT', "/api/batch-sendings/foo");
+    }
+
+    protected static function endpoint(): BatchSendingsEndpoint
+    {
+        return self::dgs()->batchSendings();
+    }
+}
diff --git a/tests/Endpoint/BatchSendingItemsEndpointTest.php b/tests/Endpoint/BatchSendingItemsEndpointTest.php
new file mode 100644
index 0000000..1290646
--- /dev/null
+++ b/tests/Endpoint/BatchSendingItemsEndpointTest.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DigitalCz\DigiSign\Endpoint;
+
+/**
+ * @covers \DigitalCz\DigiSign\Endpoint\BatchSendingsItemsEndpoint
+ */
+class BatchSendingItemsEndpointTest extends EndpointTestCase
+{
+    public function testImport(): void
+    {
+        self::endpoint()->import(['file' => 'bar']);
+        self::assertLastRequest('POST', "/api/batch-sendings/foo/items/import", ['file' => 'bar']);
+    }
+
+    protected static function endpoint(): BatchSendingsItemsEndpoint
+    {
+        return self::dgs()->batchSendings()->items('foo');
+    }
+}