output of booking_info

["booking_meta"]=>
  array(4) {
    ["attendees"]=>
    array(1) {
      [132]=>
      array(1) {
        [0]=>
        array(1) {
          ["attendee_categories"]=>
          array(2) {
            [0]=>
            string(15) "Open skateboard"
            [1]=>
            string(4) "Luge"
          }
        }
      }
    }
    ["registration"]=>
    array(2) {
      ["user_name"]=>
      string(0) ""
      ["user_email"]=>
      string(0) ""
    }
    ["booking"]=>
    array(5) {
      ["shirt_size"]=>
      string(1) "L"
      ["vegi_food"]=>
      string(1) "1"
      ["ice_name"]=>
      string(13) "Berry Plasman"
      ["ice_number"]=>
      string(10) "0612345678"
      ["safety_gear"]=>
      string(1) "1"
    }
    ["gateway"]=>
    string(7) "offline"
  }