Hello, from what I understand, you get vouchers with the SPS stake, which will generate a value for you, for example I'm receiving 0.092 per day, so I have to wait for this value to add up to 1, it will take some days.

Another way would be to buy the voucher through the market, but it seems like they were selling for $25, I'm not sure, so it's saltier to make the purchase.