Is it true that did you have to pay for rations in ww2 based on the following text?

To deal with sometimes extreme shortages, the Ministry of Food instituted a system of rationing. To buy most rationed items, each person had to register at chosen shops and was provided with a ration book containing coupons. The shopkeeper was provided with enough food for registered customers. Purchasers had to take ration books with them when shopping, so the relevant coupon or coupons could be cancelled.
yes