What is received verification request?

Request Received

This event states that the verification request has been received and is under processing. This event
only occurs when show_results = 0 for off-site verification and the request is sent to Shufti Pro for processing.

    {
       "reference".  :"17374217",
       "event"       :"request.received",
       "email"       :"johndoe@example.com",
       "country"     :"UK"
       "show_results": "0" 
    }