diff --git a/post.php b/post.php
index 5df4bc5a..8657e2d3 100644
--- a/post.php
+++ b/post.php
@@ -1313,7 +1313,10 @@ if(isset($_POST['add_invoice_copy'])){
     $client_id = $row['client_id'];
     $category_id = $row['category_id'];
 
-    mysqli_query($mysqli,"INSERT INTO invoices SET invoice_number = '$invoice_number', invoice_date = '$date', invoice_due = DATE_ADD('$date', INTERVAL $client_net_terms day), category_id = $category_id, invoice_status = 'Draft', invoice_amount = '$invoice_amount', invoice_note = '$invoice_note', invoice_created_at = NOW(), client_id = $client_id, company_id = $session_company_id") or die(mysql_error());
+    //Generate a unique URL key for clients to access
+    $url_key = keygen();
+
+    mysqli_query($mysqli,"INSERT INTO invoices SET invoice_number = '$invoice_number', invoice_date = '$date', invoice_due = DATE_ADD('$date', INTERVAL $client_net_terms day), category_id = $category_id, invoice_status = 'Draft', invoice_amount = '$invoice_amount', invoice_note = '$invoice_note', invoice_url_key = '$url_key', invoice_created_at = NOW(), client_id = $client_id, company_id = $session_company_id") or die(mysql_error());
 
     $new_invoice_id = mysqli_insert_id($mysqli);