suche in der login.php diese Zeile:
$check_customer_query = xtc_db_query("select customers_id, customers_vat_id, customers_firstname,customers_lastname, customers_gender, customers_password, customers_email_address, customers_default_address_id from ".TABLE_CUSTOMERS." where customers_email_address = '".xtc_db_input($email_address)."' and account_type = '0'");
und ersetze sie mit dieser:
$check_customer_query = xtc_db_query("select customers_id, customers_cid, customers_vat_id, customers_firstname,customers_lastname, customers_gender, customers_password, customers_email_address, customers_default_address_id from ".TABLE_CUSTOMERS." where customers_email_address = '".xtc_db_input($email_address)."' and account_type = '0'");
such diese Zeile:
$_SESSION['customer_id'] = $check_customer['customers_id'];
darunter fügst du das hier ein:
$_SESSION['customer_cid'] = $check_customer['customers_cid'];
jetzt kannst mit $_SESSION['customer_cid'] die Kundennummer in deinem Content anzeigen lassen.