Can regulars buy on account and pay later?

Yes. Select the customer at checkout and choose On Account as the payment method. A debt needs someone to own it, so On Account isn't available without a customer.

To collect, switch the top of Orders to Receivables. Debts are grouped by customer; open one to settle a single order, a whole month, or everything — each time DingPOS asks how the money was paid. A single order can also be settled from its detail view, and a settlement entered by mistake can be taken back with Undo Settlement.

• Revenue counts on the day the goods leave; Cash Received and loyalty points wait until the day it's settled.
• Unsettled orders carry an amber badge in the list, and the customer detail shows how much they currently owe.
• A customer with unsettled orders can't be deleted.