New Example: Booking List

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Hello - I am having a hard time grabbing the Booking ID to add to my repeater

In this code segment from the example -

$w( '#sessionsRepeater' ).onItemReady(($item, data) => { 
    $item( '#sessionDateText' ).text = 			data.bookedEntity.singleSession.start.toLocaleString(); 
    $item( '#sessionClientNameText' ).text = data.formInfo.contactDetails.firstName; 
    $item( '#sessionServiceText' ).text = data.bookedEntity.title; 
    $item( '#sessionStatusText' ).text = data.status; 
}); 
$w( '#sessionsRepeater' ).data = [];

If I try to add a booking ID
This doesn’t work -
$item(‘#sessionIdText’).text = data._id;
This also doesn’t work -
$item(‘#sessionIdText’).text = data.BookingId;

What do I need to call?
Thanks - I am VERY new to this, but I’ve tried everything