diff --git a/AliExpress-Invoice-Downloader.user.js b/AliExpress-Invoice-Downloader.user.js
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+++ b/AliExpress-Invoice-Downloader.user.js
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+// ==UserScript==
+// @name         AliExpress Invoice Downloader
+// @namespace    https://www.aliexpress.com
+// @version      1.0
+// @description  Adds download buttons to the Aliexpress order page (https://www.aliexpress.com/p/order/index.html) and a bulk download button to download all invoices on the order page to save time.
+// @match        https://www.aliexpress.com/p/order/index.html*
+// @grant        GM_download
+// @author       Peter Tanner
+// @namespace    https://github.com/peter-tanner/AliExpress-Invoice-Downloader/
+// @supportURL   https://github.com/peter-tanner/AliExpress-Invoice-Downloader/issues
+// @updateURL    https://github.com/peter-tanner/AliExpress-Invoice-Downloader/AliExpress-Invoice-Downloader.user.js
+// @license      GPL-3.0
+// @website      https://www.petertanner.dev/
+// ==/UserScript==
+
+(function () {
+  "use strict";
+
+  let orderIds = [];
+
+  function handleDownloadOrNavigate(link, orderId, name) {
+    const downloadButton = document.createElement("button");
+    downloadButton.textContent = "Download Invoice";
+    downloadButton.className = "aliexpress-invoice-download-button";
+    downloadButton.style.marginLeft = "10px";
+    downloadButton.addEventListener("click", () => {
+      downloadInvoice(orderId, name);
+    });
+
+    link.parentNode.appendChild(downloadButton);
+  }
+
+  function downloadInvoice(orderId, name) {
+    const sanitizedFileName = sanitizeFileName(name);
+    const url = `https://trade.aliexpress.com/ajax/invoice/invoiceExportAjax.htm?orderId=${orderId}&name=${sanitizedFileName}`;
+    GM_download({
+      url: url,
+      name: `invoice_${orderId}_${sanitizedFileName}.pdf`,
+      onerror: function (error) {
+        console.error("Error downloading:", error);
+      },
+    });
+  }
+
+  function sanitizeFileName(name) {
+    const sanitized = name.replace(/[^\x00-\x7F]/g, "").replace(/\s+/g, "_");
+    return sanitized.substring(0, 16);
+  }
+
+  function addDownloadAllButton() {
+    const downloadAllButton = document.createElement("button");
+    downloadAllButton.textContent = "Download All Invoices";
+    downloadAllButton.className = "aliexpress-download-all-button";
+    downloadAllButton.style.position = "fixed";
+    downloadAllButton.style.bottom = "10px";
+    downloadAllButton.style.left = "10px";
+    downloadAllButton.style.zIndex = "1000";
+    downloadAllButton.style.backgroundColor = "red";
+    downloadAllButton.style.color = "white";
+    downloadAllButton.style.padding = "10px";
+    downloadAllButton.style.border = "none";
+    downloadAllButton.style.cursor = "pointer";
+    downloadAllButton.addEventListener("click", () => {
+      orderIds.forEach((order) => {
+        downloadInvoice(order.orderId, order.name);
+      });
+    });
+
+    document.body.appendChild(downloadAllButton);
+  }
+
+  function createDownloadButtons() {
+    const invoiceItems = document.querySelectorAll("div.order-item");
+    invoiceItems.forEach((item) => {
+      const nameElement = item.querySelector(
+        "div.order-item-content-info-name"
+      );
+      const name = nameElement ? nameElement.textContent.trim() : "";
+      const link = item.querySelector(
+        "div.order-item-header > div.order-item-header-right > a"
+      );
+      if (link) {
+        const href = link.getAttribute("href");
+        if (href) {
+          const url = new URL(href, window.location.href);
+          const orderId = url.searchParams.get("orderId");
+          if (orderId) {
+            orderIds.push({ orderId: orderId, name: name });
+            handleDownloadOrNavigate(link, orderId, name);
+          }
+        }
+      }
+    });
+  }
+
+  const observerCallback = (mutationsList) => {
+    for (let mutation of mutationsList) {
+      if (mutation.type === "childList") {
+        const addedNodes = mutation.addedNodes;
+        addedNodes.forEach((node) => {
+          if (node.matches && node.matches("div.order-item")) {
+            const nameElement = node.querySelector(
+              "div.order-item-content-info-name"
+            );
+            const name = nameElement ? nameElement.textContent.trim() : "";
+            const link = node.querySelector(
+              "div.order-item-header > div.order-item-header-right > a"
+            );
+            if (link) {
+              const href = link.getAttribute("href");
+              if (href) {
+                const url = new URL(href, window.location.href);
+                const orderId = url.searchParams.get("orderId");
+                if (orderId) {
+                  orderIds.push({ orderId: orderId, name: name });
+                  handleDownloadOrNavigate(link, orderId, name);
+                }
+              }
+            }
+          }
+        });
+      }
+    }
+  };
+
+  const startObserverWhenReady = () => {
+    const targetNode = document.querySelector("div.comet-checkbox-group");
+    if (targetNode) {
+      const observer = new MutationObserver(observerCallback);
+      const config = { childList: true, subtree: true };
+      observer.observe(targetNode, config);
+    } else {
+      setTimeout(startObserverWhenReady, 100);
+    }
+  };
+
+  startObserverWhenReady();
+  addDownloadAllButton();
+  createDownloadButtons();
+})();