Banco de Oro or BDO Unibank Inc is the largest bank in the Philippines with over 579 branches across the country. And this makes BDO Debit Card reachable to the majority of the Philippines population If you are in Philippines and attempting to make an online payment or buy something online from a website like Lazada , Shopee or Winery by using a BDO Card, you can find the security code or the 3 digit CVV code on the card's backside and on right side of the white color signature panel.