Every May, I receive a mailing reminding me to apply for the Earned Income Tax Credit and Child Benefit.
You can apply via ARS, QR code, etc. You can apply from 6 am to 12 am. I called 1544-9944 and it took less than a minute to apply, and they gave me an estimate of how much I would receive. Please note that the amount may vary depending on your income and property requirements.