Ajax Request

is the following ajax request is correct?

$("#send_btn").click( function () {
$.ceAjax('request',
fn_url('vendor_communication.create_thread'), {
method : 'POST',
caching: false,
hidden: true,
data : {
return_url : 'vendor.php?dispatch=vendor_communication.threads',
communication_type : 'vendor_to_customer',
timeline : $('#timeline_box').val,
thread : {
object_id : {$order_info.order_id},
object_type : 'O',
subject : 'Request Modifications',
company_id : {$order_info.company_id},
message : '',
communication_type : 'vendor_to_customer'
}
},
callback : function(data) {
console.log(data);
}
});
});