This process forms part of the obligations Star Sports have as a UK licensed bookmaker. They are required to know their customer for a number of reasons. These include:
To ensure the user is aged 18 years or older.
To prevent money laundering.
To prevent identity theft.
Therefore, users are asked to provide certain documents for the user to be fully verified. The documents usually required are a passport or driving license (to verify identity), alongside a utility bill or bank statement dated within the last three months (to verify address).