access data object in jquery ajax

hi,
if i have the following jquery function getCashBackTotalAmount() that produce the object as hilited in screenshot, how can I access the TotalCashBack value?  

function getCashBackTotalAmount(u_email){
    
    console.log('cashback value');
    
    $.ajax({
        url: 'userprofile/gettotalcashback',
        data : {email:u_email},
        dataType: 'json',
        success: function(data){
            console.log('success getTotalCashBack');
            console.log(data);
            
            var $total_amt = data.TotalCashBack;
            console.log($total_amt);
            $('.earning > span').replaceWith($total_amt);
            console.log(data.length);
            
        },error : function(){
            console.log("error getTotalCashBack");
        }
        
        });
}

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screenshot.png