You will receive a letter within 15 days that may give you some guidance on what to do. If all else fails, you can get it on your 2020 tax return when you file it. The payment is actually an advance on your 2020 taxes and any discrepancies will get resolved when you file your 2020 return. I know that's not a good solution for someone who needs the money now. Wait for more info from the IRS about what to do.
