B2B wholesale ordering portal for specialty coffee roaster

We roast for 60 cafés and orders arrive by text, email, and phone calls to my personal number. Build a wholesale portal: customer-specific price lists, standing weekly orders, cut-off times by delivery zone, and a pick-list view for the roastery. Net-30 invoicing export to QuickBooks. Nothing customer-facing pretty — functional, fast on a warehouse iPad, impossible to order the wrong grind.