Adding SSN for payout

I used StubHub to sell tickets for the first time yesterday. One of the three sold. It was quite cumbersome trying to figure out how to send the tickets to the buyer. My tickets were not purchased through Ticketmaster or any other large platform. They were purchased directly from the venue's website. The venue is a small local business. I called StubHub and they told me to email the ticket/QR code which was saved in My Wallet directly to the buyer. I did that while I was on the phone with the representative and he told me to send him a screenshot of the email showing that it was sent. Which I did and he told me he added it to the sale. A few minutes later I received an email from StubHub advising that I will not get paid until and unless I provide my Social Security number. I'm concerned about doing that. Does anyone have any feedback to share good or bad?