Assegno Unico e Universale (AUU) is a form of financial support granted by the INPS (the National Security Institute) for family units with dependent children under 21 years old.

The amount depends on family household income, that has to be certified by ISEE. If you don't have ISEE you will receive the minimum amount.

It is paid directly by INPS. 

The request should be made online to INPS or to a CAF (Centre for Fiscal assistance). 

To check if you have the requirements to apply for Assegno unico (e.g. have the residence and domicile in Italy, pay IRPEF tax etc...) you may contact a CAF or your human resources office.