Douyin merchants can check who has placed an order for group purchases by following the steps below:

1. Open the Douyin e-commerce platform and enter the order management page.

2. Find the corresponding group purchase order and click the order number to enter the order details page.

3. On the order details page, you can see the "Transaction User" column, which displays the nickname and avatar of the buyer who placed the order.

4. If you need to view more information, you can click the "View" button next to the "Transaction User" to enter the buyer's homepage to view detailed information.

It should be noted that in order to protect the privacy of users, Douyin merchants can only view part of the buyer's information on the order details page and cannot contact the buyer directly. If you need to communicate with the buyer, it is recommended to use Douyin's built-in customer service system to contact.