KYC (Know Your Customer) is a standard identity verification procedure needed for users who signed up with a Professional account. It is required by the payment processor and Show4me to fight fraud, money laundering and financing of terrorism. Passing KYC procedure is required only once. You can pass the KYC procedure in your profile Settings.
Please notice, that you won't be able to request payouts and verify your Professional account or Artistclub without completing the KYC procedure.
Once you pass the KYC procedure, you'll get a grey mark on your profile page. See example below.