[test] contact to setting modules

app/order/manage_invoice.php

@@ -123,6 +123,11 @@
                 <i class="ti ti-send me-1"></i>Issue Invoice
               </button>
 
+              <button class="btn btn-outline-secondary w-100" id="btn_print"
+                onclick="print_invoice()">
+                <i class="ti ti-printer me-1"></i>Print / Save PDF
+              </button>
+
               <!-- Status selector (issued and above) -->
               <div class="" id="invoice_status_group">
                 <label class="form-label small text-muted mb-1">Invoice Status</label>
@@ -345,6 +350,12 @@
   }
 
 
+  function print_invoice() {
+    if (!invoice_id) return;
+    window.open('<?php echo $server_url?>order/print_invoice.php?id=' + invoice_id, '_blank');
+  }
+
+
   $(function() {
     if (invoice_id) {
       retrieve_invoice();