下单时用币支付时，余额不足时订单加入队列

src/main/java/com/peanut/modules/book/controller/BuyOrderController.java

@@ -338,6 +338,12 @@ public class BuyOrderController {
                 //发放优惠卷
                 couponService.insertCouponHistoryByProductId(buyOrder);
             } else {
+                rabbitTemplate.convertAndSend(
+                        DelayQueueConfig.ORDER_TO_BE_PAY_EXCHANGE,
+                        DelayQueueConfig.ORDER_TO_BE_PAY_ROUTING_KEY,
+                        buyOrder.getOrderId(),
+                        messagePostProcessor()
+                );
                 return R.error(500, "天医币余额不足！");
             }
         }