diff --git a/README.md b/README.md
index 88b2bc7..ceeda5b 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,10 @@ The system allows you to:
 - Automatically upload product photos from Google Drive to Shopify.
 - specific triggers (`onEdit`, `onOpen`) to sync changes to Shopify in real-time or on-demand.
 - Handle rate limiting and concurrency using a custom queue system.
+- Handle rate limiting and concurrency using a custom queue system.
 - Monitor and troubleshoot background processes via a custom side panel.
+- **Automated Sales Sync**: Periodically check Shopify for recent sales and mark items as "sold" in the sheet.
+- **Manual Reconciliation**: Backfill sales data for a specific time range via menu command.
 
 ## Prerequisites
 
diff --git a/docs/SETUP.md b/docs/SETUP.md
index cbe31e1..811f103 100644
--- a/docs/SETUP.md
+++ b/docs/SETUP.md
@@ -52,6 +52,7 @@
     - `shopifyLocationId`: Location ID for inventory.
     - `shopifyCountryCodeOfOrigin`: Two-letter country code (e.g., `US`).
     - `shopifyProvinceCodeOfOrigin`: Two-letter province code (e.g., `NY`).
+    - `SalesSyncFrequency`: Interval (in minutes) to check for new sales. Valid: 1, 5, 10, 15, 30.
 
 ## Deployment
 
diff --git a/src/appsscript.json b/src/appsscript.json
index 3285671..43cb781 100644
--- a/src/appsscript.json
+++ b/src/appsscript.json
@@ -7,6 +7,8 @@
   "oauthScopes": [
     "https://www.googleapis.com/auth/spreadsheets",
     "https://www.googleapis.com/auth/script.external_request",
-    "https://www.googleapis.com/auth/script.container.ui"
+    "https://www.googleapis.com/auth/script.container.ui",
+    "https://www.googleapis.com/auth/script.scriptapp",
+    "https://www.googleapis.com/auth/drive"
   ]
 }
diff --git a/src/config.ts b/src/config.ts
index 710a88f..1c60770 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -10,6 +10,7 @@ export class Config {
   shopifyLocationId: string
   shopifyCountryCodeOfOrigin: string
   shopifyProvinceCodeOfOrigin: string
+  salesSyncFrequency: number
 
   constructor() {
     let ss = SpreadsheetApp.getActive()
@@ -69,5 +70,12 @@ export class Config {
       "shopifyProvinceCodeOfOrigin",
       "value"
     )
+    let freq = vlookupByColumns(
+      "vars",
+      "key",
+      "SalesSyncFrequency",
+      "value"
+    )
+    this.salesSyncFrequency = freq ? parseInt(freq) : 10
   }
 }
diff --git a/src/global.ts b/src/global.ts
index d265f6a..32f3c6a 100644
--- a/src/global.ts
+++ b/src/global.ts
@@ -21,6 +21,8 @@ import {
 } from "./onEditQueue"
 import { fillProductFromTemplate } from "./fillProductFromTemplate"
 import { showSidebar, getQueueStatus, setQueueEnabled, deleteEdit, pushEdit } from "./sidebar"
+import { checkRecentSales, reconcileSalesHandler } from "./salesSync"
+import { installSalesSyncTrigger } from "./triggers"
 
 // prettier-ignore
 ;(global as any).onOpen = onOpen
@@ -43,3 +45,6 @@ import { showSidebar, getQueueStatus, setQueueEnabled, deleteEdit, pushEdit } fr
 ;(global as any).setQueueEnabled = setQueueEnabled
 ;(global as any).deleteEdit = deleteEdit
 ;(global as any).pushEdit = pushEdit
+;(global as any).checkRecentSales = checkRecentSales
+;(global as any).reconcileSalesHandler = reconcileSalesHandler
+;(global as any).installSalesSyncTrigger = installSalesSyncTrigger
diff --git a/src/initMenu.ts b/src/initMenu.ts
index 0eb6802..6f49184 100644
--- a/src/initMenu.ts
+++ b/src/initMenu.ts
@@ -2,7 +2,8 @@ import { getShopifyProducts, runShopifyOrders } from "./shopifyApi"
 import { fillProductFromTemplate } from "./fillProductFromTemplate"
 import { createMissingPhotoFolders } from "./createMissingPhotoFolders"
 import { matchProductToShopify, updateProductToShopify } from "./match"
-import { reinstallTriggers } from "./triggers"
+import { reinstallTriggers, installSalesSyncTrigger } from "./triggers"
+import { reconcileSalesHandler } from "./salesSync"
 import { toastAndLog } from "./sheetUtils"
 import { showSidebar } from "./sidebar"
 
@@ -23,6 +24,7 @@ export function initMenu() {
         .addItem("Create missing photo folders", createMissingPhotoFolders.name)
         .addItem("Run Shopify Orders", runShopifyOrders.name)
         .addItem("Get Shopify Products", getShopifyProducts.name)
+        .addItem("Reconcile Sales...", reconcileSalesHandler.name)
     )
     .addSeparator()
     .addSubMenu(
@@ -30,6 +32,7 @@ export function initMenu() {
         .createMenu("Utilities...")
         .addItem("Reauthorize script", reauthorizeScript.name)
         .addItem("Reinstall triggers", reinstallTriggers.name)
+        .addItem("Update Sales Sync Trigger", installSalesSyncTrigger.name)
         .addItem("Troubleshoot", showSidebar.name)
     )
     .addToUi()
diff --git a/src/salesSync.ts b/src/salesSync.ts
new file mode 100644
index 0000000..c80eed2
--- /dev/null
+++ b/src/salesSync.ts
@@ -0,0 +1,111 @@
+import { Config } from "./config";
+import { Shop } from "./shopifyApi";
+import { Product } from "./Product";
+import { getRowByColumnValue, getCellRangeByColumnName, toastAndLog } from "./sheetUtils";
+
+// Declare SpreadsheetApp globally for Google Apps Script environment
+declare var SpreadsheetApp: GoogleAppsScript.Spreadsheet.SpreadsheetApp;
+
+export function checkRecentSales() {
+  console.log("Starting checkRecentSales...");
+  const config = new Config();
+  const freq = config.salesSyncFrequency || 10;
+
+  // 2.5x lookback
+  const now = new Date();
+  const lookbackMs = freq * 2.5 * 60 * 1000;
+  const startTime = new Date(now.getTime() - lookbackMs);
+
+  const shop = new Shop();
+  console.log(`Fetching orders from ${startTime.toISOString()} to ${now.toISOString()}`);
+
+  const orders = shop.FetchOrders(startTime, now);
+  console.log(`Found ${orders.length} orders.`);
+
+  syncOrders(orders, shop);
+}
+
+export function reconcileSalesHandler() {
+    const ui = SpreadsheetApp.getUi();
+    const result = ui.prompt("Reconcile Sales", "Enter number of days to look back:", ui.ButtonSet.OK_CANCEL);
+
+    if (result.getSelectedButton() == ui.Button.OK) {
+        const days = parseInt(result.getResponseText());
+        if (isNaN(days) || days <= 0) {
+            toastAndLog("Invalid number of days.");
+            return;
+        }
+
+        toastAndLog(`Reconciling sales for last ${days} days...`);
+        const now = new Date();
+        const startTime = new Date(now.getTime() - (days * 24 * 60 * 60 * 1000));
+
+        const shop = new Shop();
+        const orders = shop.FetchOrders(startTime, now);
+        toastAndLog(`Found ${orders.length} orders. Syncing...`);
+
+        syncOrders(orders, shop);
+        toastAndLog("Reconciliation complete.");
+    }
+}
+
+function syncOrders(orders: any[], shop: Shop) {
+  const processedSkus = new Set<string>();
+
+  for (const order of orders) {
+    const lineItems = order.line_items;
+    if (!lineItems || !Array.isArray(lineItems)) continue;
+
+    for (const item of lineItems) {
+      const sku = item.sku;
+      if (!sku) continue;
+
+      if (processedSkus.has(sku)) continue;
+      processedSkus.add(sku);
+
+      console.log(`Processing sold SKU: ${sku}`);
+
+      try {
+        const row = getRowByColumnValue("product_inventory", "sku", sku);
+        if (!row) {
+          console.log(`SKU ${sku} not found in sheet.`);
+          continue;
+        }
+
+        const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("product_inventory");
+        if (!sheet) {
+            console.error("Could not find product_inventory sheet");
+            continue;
+        }
+
+        // 1. Update status to 'sold'
+        const statusCell = getCellRangeByColumnName(sheet, "status", row);
+        if (statusCell) {
+             const currentStatus = statusCell.getValue();
+             if (currentStatus !== "sold") {
+                 statusCell.setValue("sold");
+                 console.log(`Set status='sold' for SKU ${sku}`);
+             }
+        } else {
+            console.warn(`Could not find 'status' column for SKU ${sku}`);
+        }
+
+        // 2. Sync Shopify Status
+        // Use Product class to fetch fresh data
+        const product = new Product(sku);
+        product.MatchToShopifyProduct(shop);
+
+        if (product.shopify_product && product.shopify_product.status) {
+           const shopifyStatusCell = getCellRangeByColumnName(sheet, "shopify_status", row);
+           if (shopifyStatusCell) {
+               shopifyStatusCell.setValue(product.shopify_product.status);
+               console.log(`Updated shopify_status='${product.shopify_product.status}' for SKU ${sku}`);
+           }
+        }
+
+      } catch (e) {
+        console.error(`Error processing SKU ${sku}: ${e}`);
+      }
+    }
+  }
+}
diff --git a/src/shopifyApi.ts b/src/shopifyApi.ts
index 4c2cb83..a2068e2 100644
--- a/src/shopifyApi.ts
+++ b/src/shopifyApi.ts
@@ -482,6 +482,48 @@ export class Shop {
     } while (!done)
   }
 
+  FetchOrders(start: Date, end: Date) {
+    let endpoint = Shop.endpoints.orders
+    let start_str = start.toISOString()
+    let end_str = end.toISOString()
+    var params = {
+      created_at_min: start_str,
+      created_at_max: end_str,
+      fields: "id,created_at,financial_status,name,line_items,subtotal_price,total_price,total_tax",
+      status: "any"
+    }
+
+    var all_orders: any[] = []
+    var done = false
+    var next_link = ""
+    do {
+      var response
+      if (next_link === "") {
+        response = this.shopifyAPI(endpoint, params)
+      } else {
+        response = this.shopifyAPI(endpoint, params, next_link)
+      }
+      let resp = response.content
+      let headers = response.headers
+      var orders_arr = resp["orders"]
+      if (orders_arr.length > 0) {
+        all_orders = all_orders.concat(orders_arr)
+      }
+
+      if (headers["Link"] !== undefined) {
+        var links = parseLinkHeader(headers["Link"])
+        if (links["next"] === undefined) {
+          done = true
+        } else {
+          next_link = links["next"]["href"]
+        }
+      } else {
+        done = true
+      }
+    } while (!done)
+    return all_orders
+  }
+
   GetProducts() {
     let done = false
     let query = ""
diff --git a/src/triggers.ts b/src/triggers.ts
index a6c78d9..0a44105 100644
--- a/src/triggers.ts
+++ b/src/triggers.ts
@@ -17,4 +17,35 @@ export function reinstallTriggers() {
     .timeBased()
     .everyMinutes(1)
     .create()
+
+  installSalesSyncTrigger()
+}
+
+import { Config } from "./config"
+
+export function installSalesSyncTrigger() {
+  const config = new Config()
+  // Valid minute intervals for Apps Script
+  const valid = [1, 5, 10, 15, 30]
+  let freq = config.salesSyncFrequency || 10
+
+  if (valid.indexOf(freq) === -1) {
+    console.warn(`Invalid frequency ${freq}. Must be 1, 5, 10, 15, 30. Defaulting to 10.`)
+    freq = 10
+  }
+
+  // Delete existing 'checkRecentSales' triggers to avoid duplicates
+  const triggers = ScriptApp.getProjectTriggers()
+  for (const t of triggers) {
+    if (t.getHandlerFunction() === "checkRecentSales") {
+      ScriptApp.deleteTrigger(t)
+    }
+  }
+
+  ScriptApp.newTrigger("checkRecentSales")
+    .timeBased()
+    .everyMinutes(freq)
+    .create()
+
+  console.log(`Installed 'checkRecentSales' trigger running every ${freq} minutes.`)
 }