Our Print API is a custom solution and you can build pre-orders into your integration. You would withhold sending us the print requests until you are ready for us to fulfill the orders.Alternatively, the Order Import Tool, available through the Lulu Direct Dashboard on Lulu.com, allows you to import a .CSV or a .XLSX file containing multiple orders for Lulu projects that you've collected outside of Lulu.Note: If you plan on sending us more than 500 orders at once, then we do recommend you reach out to us so we can coordinate with our print partners so they can prepare for the influx of orders and provide a smoother launch of your product.