diff --git a/DotNET/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.cs b/DotNET/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.cs
new file mode 100644
index 0000000..b7b00ee
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+++ b/DotNET/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.cs	
@@ -0,0 +1,29 @@
+using System.Text;
+
+using (var httpClient = new HttpClient { BaseAddress = new Uri("https://api.pdfrest.com") })
+{
+    using (var request = new HttpRequestMessage(HttpMethod.Post, "pdf-with-added-attachment"))
+    {
+        request.Headers.TryAddWithoutValidation("Api-Key", "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx");
+        request.Headers.Accept.Add(new("application/json"));
+        var multipartContent = new MultipartFormDataContent();
+
+        var byteArray = File.ReadAllBytes("/path/to/file");
+        var byteAryContent = new ByteArrayContent(byteArray);
+        multipartContent.Add(byteAryContent, "file", "file_name");
+        byteAryContent.Headers.TryAddWithoutValidation("Content-Type", "application/pdf");
+
+        var byteArray2 = File.ReadAllBytes("/path/to/file");
+        var byteAryContent2 = new ByteArrayContent(byteArray2);
+        multipartContent.Add(byteAryContent2, "file_to_attach", "file_name");
+        byteAryContent2.Headers.TryAddWithoutValidation("Content-Type", "application/xml"); // Update content type
+
+        request.Content = multipartContent;
+        var response = await httpClient.SendAsync(request);
+
+        var apiResult = await response.Content.ReadAsStringAsync();
+
+        Console.WriteLine("API response received.");
+        Console.WriteLine(apiResult);
+    }
+}
diff --git a/Java/Endpoint Examples/Multipart Payload/PdfWithAddedAttachment.java b/Java/Endpoint Examples/Multipart Payload/PdfWithAddedAttachment.java
new file mode 100644
index 0000000..73caf6a
--- /dev/null
+++ b/Java/Endpoint Examples/Multipart Payload/PdfWithAddedAttachment.java	
@@ -0,0 +1,69 @@
+import io.github.cdimascio.dotenv.Dotenv;
+import java.io.File;
+import java.io.IOException;
+import okhttp3.MediaType;
+import okhttp3.MultipartBody;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
+import org.json.JSONObject;
+
+public class PdfWithAddedAttachment {
+
+  // Specify the path to your file here, or as the first argument when running the program.
+  private static final String DEFAULT_FILE_PATH = "/path/to/file.pdf";
+
+  // Specify the path to your file attachment here, or as the second argument when running the
+  // program.
+  private static final String DEFAULT_ATTACHMENT_PATH = "/path/to/file.xml";
+
+  // Specify your API key here, or in the environment variable PDFREST_API_KEY.
+  // You can also put the environment variable in a .env file.
+  private static final String DEFAULT_API_KEY = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";
+
+  public static void main(String[] args) {
+    File inputFile, attachmentFile;
+    if (args.length > 1) {
+      inputFile = new File(args[0]);
+      attachmentFile = new File(args[1]);
+    } else {
+      inputFile = new File(DEFAULT_FILE_PATH);
+      attachmentFile = new File(DEFAULT_ATTACHMENT_PATH);
+    }
+
+    final Dotenv dotenv = Dotenv.configure().ignoreIfMalformed().ignoreIfMissing().load();
+
+    final RequestBody inputFileRequestBody =
+        RequestBody.create(inputFile, MediaType.parse("application/pdf"));
+    final RequestBody attachmentFileRequestBody =
+        RequestBody.create(attachmentFile, MediaType.parse("application/xml"));
+    RequestBody requestBody =
+        new MultipartBody.Builder()
+            .setType(MultipartBody.FORM)
+            .addFormDataPart("file", inputFile.getName(), inputFileRequestBody)
+            .addFormDataPart("file_to_attach", attachmentFile.getName(), attachmentFileRequestBody)
+            .build();
+    Request request =
+        new Request.Builder()
+            .header("Api-Key", dotenv.get("PDFREST_API_KEY", DEFAULT_API_KEY))
+            .url("https://api.pdfrest.com/pdf-with-added-attachment")
+            .post(requestBody)
+            .build();
+    try {
+      OkHttpClient client = new OkHttpClient().newBuilder().build();
+      Response response = client.newCall(request).execute();
+      System.out.println("Result code " + response.code());
+      if (response.body() != null) {
+        System.out.println(prettyJson(response.body().string()));
+      }
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  private static String prettyJson(String json) {
+    // https://stackoverflow.com/a/9583835/11996393
+    return new JSONObject(json).toString(4);
+  }
+}
diff --git a/JavaScript/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.js b/JavaScript/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.js
new file mode 100644
index 0000000..438b8a3
--- /dev/null
+++ b/JavaScript/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.js	
@@ -0,0 +1,36 @@
+/**
+ * This request demonstrates how to apply a file watermark to a PDF. This kind of watermark uses another PDF (using either watermark_file or watermark_file_id as a form-data parameter) and applies it as a watermark to the primary input document (file or id).
+ * Horizontal and vertical offsets of the watermark are measured in PDF units. (1 inch = 72 PDF units)
+ */
+var axios = require('axios');
+var FormData = require('form-data');
+var fs = require('fs');
+
+// Create a new form data instance and append the PDF file and parameters to it
+var data = new FormData();
+data.append('file', fs.createReadStream('/path/to/file'));
+data.append('file_to_attach', fs.createReadStream('/path/to/file'));
+data.append('output', 'pdfrest_pdf_with_added_attachment');
+
+// define configuration options for axios request
+var config = {
+  method: 'post',
+  maxBodyLength: Infinity, // set maximum length of the request body
+  url: 'https://api.pdfrest.com/pdf-with-added-attachment', 
+  headers: { 
+    'Api-Key': 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx', // Replace with your API key
+    ...data.getHeaders() // set headers for the request
+  },
+  data : data // set the data to be sent with the request
+};
+
+// send request and handle response or error
+axios(config)
+.then(function (response) {
+  console.log(JSON.stringify(response.data));
+})
+.catch(function (error) {
+  console.log(error); 
+});
+
+// If you would like to download the file instead of getting the JSON response, please see the 'get-resource-id-endpoint.js' sample.
diff --git a/PHP/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.php b/PHP/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.php
new file mode 100644
index 0000000..f1dad92
--- /dev/null
+++ b/PHP/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.php	
@@ -0,0 +1,43 @@
+<?php
+require 'vendor/autoload.php'; // Require the autoload file to load Guzzle HTTP client.
+
+use GuzzleHttp\Client; // Import the Guzzle HTTP client namespace.
+use GuzzleHttp\Psr7\Request; // Import the PSR-7 Request class.
+use GuzzleHttp\Psr7\Utils; // Import the PSR-7 Utils class for working with streams.
+
+$client = new Client(); // Create a new instance of the Guzzle HTTP client.
+
+$headers = [
+  'Api-Key' => 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' // Set the API key in the headers for authentication.
+];
+
+$options = [
+  'multipart' => [
+    [
+      'name' => 'file', // Specify the field name for the main PDF file.
+      'contents' => Utils::tryFopen('/path/to/file', 'r'), // Open the main PDF file specified by the '/path/to/file' for reading.
+      'filename' => '/path/to/file', // Set the filename for the main PDF file to be processed, in this case, '/path/to/file'.
+      'headers' => [
+        'Content-Type' => '<Content-type header>' // Set the Content-Type header for the main PDF file.
+      ]
+    ],
+    [
+      'name' => 'file_to_attach', // Specify the field name for the file attachment.
+      'contents' => Utils::tryFopen('/path/to/file', 'r'), // Open the file attachment specified by the '/path/to/file' for reading.
+      'filename' => '/path/to/file', // Set the filename for the file attachment to be added, in this case, '/path/to/file'.
+      'headers' => [
+        'Content-Type' => '<Content-type header>' // Set the Content-Type header for the file attachment.
+      ]
+    ],
+    [
+      'name' => 'output', // Specify the field name for the output option.
+      'contents' => 'pdfrest_pdf_with_added_attachment' // Set the value for the output option (in this case, 'pdfrest_pdf_with_added_attachment').
+    ]
+  ]
+];
+
+$request = new Request('POST', 'https://api.pdfrest.com/pdf-with-added-attachment', $headers); // Create a new HTTP POST request with the API endpoint and headers.
+
+$res = $client->sendAsync($request, $options)->wait(); // Send the asynchronous request and wait for the response.
+
+echo $res->getBody(); // Output the response body, which contains the processed PDF with the added attachment.
diff --git a/Python/Endpoint Examples/JSON Payload/pdf-with-added-attachment.py b/Python/Endpoint Examples/JSON Payload/pdf-with-added-attachment.py
new file mode 100644
index 0000000..3760cf2
--- /dev/null
+++ b/Python/Endpoint Examples/JSON Payload/pdf-with-added-attachment.py	
@@ -0,0 +1,55 @@
+import requests
+import json
+
+with open('/path/to/pdf_file', 'rb') as f:
+    upload_pdf_data = f.read()
+
+print("Uploading PDF file...")
+upload_pdf_response = requests.post(url='https://api.pdfrest.com/upload',
+                    data=upload_pdf_data,
+                    headers={'Content-Type': 'application/octet-stream', 'content-filename': 'pdf_file.pdf', "API-Key": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"})
+
+print("Upload PDF response status code: " + str(upload_pdf_response.status_code))
+
+
+with open('/path/to/file_attachment', 'rb') as f:
+    upload_attachment_data = f.read()
+
+print("Uploading file attachment...")
+upload_attachment_response = requests.post(url='https://api.pdfrest.com/upload',
+                    data=upload_attachment_data,
+                    headers={'Content-Type': 'application/octet-stream', 'Content-Filename': 'data_file.xml', "API-Key": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"})
+
+print("Upload data file response status code: " + str(upload_attachment_response.status_code))
+
+if upload_pdf_response.ok and upload_attachment_response.ok:
+    upload_pdf_response_json = upload_pdf_response.json()
+    print(json.dumps(upload_pdf_response_json, indent = 2))
+
+    upload_attachment_response_json = upload_attachment_response.json()
+    print(json.dumps(upload_attachment_response_json, indent = 2))
+
+
+    uploaded_pdf_id = upload_pdf_response_json['files'][0]['id']
+    uploaded_attachment_id = upload_attachment_response_json['files'][0]['id']
+    added_attachment_data = { "id" : uploaded_pdf_id, "id_to_attach": uploaded_attachment_id }
+    print(json.dumps(added_attachment_data, indent = 2))
+
+
+    print("Processing file...")
+    added_attachment_response = requests.post(url='https://api.pdfrest.com/pdf-with-added-attachment',
+                        data=json.dumps(added_attachment_data),
+                        headers={'Content-Type': 'application/json', "API-Key": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"})
+
+
+
+    print("Processing response status code: " + str(added_attachment_response.status_code))
+    if added_attachment_response.ok:
+        added_attachment_response_json = added_attachment_response.json()
+        print(json.dumps(added_attachment_response_json, indent = 2))
+
+    else:
+        print(added_attachment_response.text)
+else:
+    print(upload_pdf_response.text)
+    print(upload_attachment_response.text)
diff --git a/Python/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.py b/Python/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.py
new file mode 100644
index 0000000..f760ad4
--- /dev/null
+++ b/Python/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.py	
@@ -0,0 +1,30 @@
+from requests_toolbelt import MultipartEncoder
+import requests
+import json
+
+pdf_with_added_attachment_endpoint_url = 'https://api.pdfrest.com/pdf-with-added-attachment'
+
+mp_encoder_pdfWithAddedAttachment = MultipartEncoder(
+    fields={
+        'file': ('file_name', open('/path/to/file', 'rb'), 'application/pdf'),
+        'file_to_attach': ('file_name', open('/path/to/file', 'rb'), 'application/xml'), # Update content type
+        'output' : 'example_out',
+    }
+)
+
+headers = {
+    'Accept': 'application/json',
+    'Content-Type': mp_encoder_pdfWithAddedAttachment.content_type,
+    'Api-Key': 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' # place your api key here
+}
+
+print("Sending POST request to pdf-with-added-attachment endpoint...")
+response = requests.post(pdf_with_added_attachment_endpoint_url, data=mp_encoder_pdfWithAddedAttachment, headers=headers)
+
+print("Response status code: " + str(response.status_code))
+
+if response.ok:
+    response_json = response.json()
+    print(json.dumps(response_json, indent = 2))
+else:
+    print(response.text)
diff --git a/cURL/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.sh b/cURL/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.sh
new file mode 100644
index 0000000..b725b93
--- /dev/null
+++ b/cURL/Endpoint Examples/Multipart Payload/pdf-with-added-attachment.sh	
@@ -0,0 +1,7 @@
+curl -X POST "https://api.pdfrest.com/pdf-with-added-attachment" \
+  -H "Accept: application/json" \
+  -H "Content-Type: multipart/form-data" \
+  -H "Api-Key: xxxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" \
+  -F "file=@/path/to/file" \
+  -F "file_to_attach=@/path/to/file" \
+  -F "output=example_out"