QPMN Print‑on‑Demand POD App

I'm new to printing on demand and we're only selling one, fairly niche, product at this point. So far QPMN has worked well - integrating with our Shopify store easily. The backend process once an order comes in was slightly unclear to me but all appears to be working well. Delivery can take a few weeks, depending on where the customer is located, but we've let our customers know that before they order.
The quality of the printing is great.