diff --git a/src/veryfi/Client.php b/src/veryfi/Client.php
index 6b2025f..e8f9b3d 100644
--- a/src/veryfi/Client.php
+++ b/src/veryfi/Client.php
@@ -129,7 +129,7 @@ public function __construct(string $client_id,
     private function get_headers(): array
     {
         return array(
-            'User-Agent' => 'php veryfi-php/1.0.2',
+            'User-Agent' => 'php veryfi-php/1.0.3',
             'Accept' => 'application/json',
             'Content-Type' => 'application/json',
             'Client-ID' => $this->client_id,
@@ -519,4 +519,35 @@ public function delete_tag(int $document_id,
         $request_arguments = array();
         return $this->request('DELETE', $endpoint_name, $request_arguments);
     }
+
+    /**
+     * Add multiple tags on an existing document
+     *
+     * @param int $document_id ID of the document you'd like to add a Tag
+     * @param array $tags array of strings
+     * @return string Added tag data
+     */
+    public function add_tags(int $document_id,
+                            array $tags): string
+    {
+        $endpoint_name = "/documents/$document_id/tags/";
+        $request_arguments = array('tags' => $tags);
+        return $this->request('POST', $endpoint_name, $request_arguments);
+    }
+
+    /**
+     * Replace multiple tags on an existing document
+     *
+     * @param int $document_id ID of the document you'd like to add a Tag
+     * @param array $tags array of strings
+     * @return string Added tag data
+     */
+    public function replace_tags(int $document_id,
+                             array $tags): string
+    {
+        $endpoint_name = "/documents/$document_id/";
+        $request_arguments = array('tags' => $tags);
+        return $this->request('PUT', $endpoint_name, $request_arguments);
+    }
+
 }
diff --git a/tests/ClientTest.php b/tests/ClientTest.php
index 050a74c..335d739 100644
--- a/tests/ClientTest.php
+++ b/tests/ClientTest.php
@@ -459,4 +459,50 @@ public function test_delete_tag(): void
         $json_response = json_decode($veryfi_client->delete_tag($document_id, $tag_id), true);
         $this->assertEmpty($json_response);
     }
+
+    public function test_replace_document_tags(): void
+    {
+        $document_id = 140804210;
+        if ($this->mock_responses) {
+            $veryfi_client = $this->getMockBuilder(Client::class)
+                ->onlyMethods(['exec_curl'])
+                ->setConstructorArgs([$this->client_id, $this->client_secret, $this->username, $this->api_key])
+                ->getMock();
+
+            $file_path = __DIR__ . '/resources/getTags.json';
+            $file = fopen($file_path, 'r');
+            $file_data = mb_convert_encoding(fread($file, filesize($file_path)), 'UTF-8');
+            $veryfi_client->expects($this->once())
+                ->method('exec_curl')
+                ->willReturn($file_data);
+        } else {
+            $veryfi_client = new Client($this->client_id, $this->client_secret, $this->username, $this->api_key);
+        }
+        $tags = array('TAG_1', 'TAG_2', 'TAG_3');
+        $json_response = json_decode($veryfi_client->replace_tags($document_id, $tags), true);
+        $this->assertNotEmpty($json_response);
+    }
+
+    public function test_add_document_tags(): void
+    {
+        $document_id = 140804210;
+        if ($this->mock_responses) {
+            $veryfi_client = $this->getMockBuilder(Client::class)
+                ->onlyMethods(['exec_curl'])
+                ->setConstructorArgs([$this->client_id, $this->client_secret, $this->username, $this->api_key])
+                ->getMock();
+
+            $file_path = __DIR__ . '/resources/getTags.json';
+            $file = fopen($file_path, 'r');
+            $file_data = mb_convert_encoding(fread($file, filesize($file_path)), 'UTF-8');
+            $veryfi_client->expects($this->once())
+                ->method('exec_curl')
+                ->willReturn($file_data);
+        } else {
+            $veryfi_client = new Client($this->client_id, $this->client_secret, $this->username, $this->api_key);
+        }
+        $tags = array('TAG_1', 'TAG_2', 'TAG_3');
+        $json_response = json_decode($veryfi_client->add_tags($document_id, $tags), true);
+        $this->assertNotEmpty($json_response);
+    }
 }