Get Password PPPoE Indihome ( Fiberhome )

get-password-fiberhome.js

// Login to fiberhome modem 
// Paste this script inside browser console

$.ajax({
    url: '/cgi-bin/ajax?ajaxmethod=get_allwan_info',
    success: (data)=>{
        data = JSON.parse(data) 
        data.wan.forEach(v => {
            if(v.AddressingType == 'PPPoE'){
                console.log("Username: "+ v.Username)
                console.log("Password: "+ fhdecrypt(v.Password) )
            }
        })    
    }
})

Can we get password of pppoe from config backup? How can we get backup?