We have our nice, basic retail site running and all appears to be quite good. One thing that is missing is the facility for our customers to make a purchase through the site via Purchase Order. We only want this facility to be available to specific customers and we also need the option for them to upload their own Purchase Order to the order. We can then review the order internally, send confirmation and ship the goods.
I can find how to set Purchase Order as a manual payment but, nowhere for the customer to upload their PO to an order. Shopify is becoming less and less advantageous for us to use with the constant need for apps, rejigs and the like. Can anyone help with this? I would ideally prefer not to require (yet another) app but, if it works, it will have to do.