This article will illustrate how to create a "Purchase Order" Custom Payment Method that can be selected by your customers at checkout.
1. Login to your Administration Console. Once in, navigate to Settings > Payments & Taxes > Custom Payment Types.
2. Click New to, add a method name and description, and modifier amount and type (if applicable), then click save.
3. After your new "payment type" is listed, you can then add inputs to it, which will prompt the user for additional information. In our case, we are going to require them to input PO Account number. Click "New Field" in lower right to get to this screen.
4. You should now see this new Custom Payment Method.