Master can. If it is customer service, you may not have permission to modify the price. At the same time, it is not allowed to modify the price after participating in activities such as praise trading.
You can reduce the price or increase the price. No problem. Many sellers should. This is a normal transaction. Sometimes sellers promote sales, and the price may not change after taking pictures of the baby. At this time, you need to tell the seller yourself and let them modify the price. If you don't see the payment clearly, you should communicate with the seller. If it is really because the seller forgot to modify the price, he can negotiate a return. If the seller can't negotiate, you can complain or have a bad review.