回复：是 immigrant visa processing fee bill

我记得是要求我等待文件寄到家里来，填好后再寄给相应部门。现在有点担心是不是自己哪里做错了。
-No, you did nothing wrong. You need to keep the receipt of your payment. You will receive the packet from National Visa Center (NVC) very soon and just follow the instructions in the packet to complete the forms and provide the required documents after you receive the packet from NVC. So, just wait.