Trustigo.tech aims to provide the complete solution to vendors with our Purchase Order system. A purchase order, or PO, is an official document issued by a buyer committing to pay the seller for the sale of specific products or services to be delivered in the future. The advantage to the buyer is the ability to place an order without immediate payment. From the seller’s perspective, a PO is a way to offer buyers credit without risk, since the buyer is obligated to pay once the products or services have been delivered.