Recording advance payments invoiced on reducing balance using coupons

How do I record advance payments for purchase of goods or commodities such fuel at the filling station to be drawn on reducing balance by using tomcards or coupons.

Read the Guide: Record supplier deposits and advances | Manager. This will cover a situation where you pay the filling station in advance.

Coupons are discounts, since they generally have no value of their own. Read this Guide: Apply a discount to a line item | Manager.

Prepaid credit or debit cards are probably best handled as cash accounts. Read this one: Set up a cash account | Manager.

In general, there is a Guide covering almost everything.

Thank you for your help, will take time to read the guides