There is no such thing as certificates in the US. In India, when you trade you get an email from NSDL. In the US, you don't get/ask for the same thing. You may refer here for confirmation from the SEC: https://www.sec.gov/fast-answers/answersowncerthtm.html

The next business day, you will get a trade statement report. You can find this under the “Profile” tab, “Trade Confirmations”