修复支付订单bug

service/product/product_service.go

@@ -140,7 +140,7 @@ func convertToProductDTO(product merchantService.MerchantProductDTO) (productDTO
 		Id:          product.Id,
 		Title:       product.Title,
 		Description: product.Description,
-		Price:       product.Price.String(),
+		Price:       product.Price,
 		RiskLevel:   product.RiskLevel,
 		CoverSrc:    product.CoverSrc,
 		CoverUrl:    product.CoverUrl,