php - Change total and tax_total Woocommerce -

i create custom checkout page custom calculation. how cant change total , tax_total via ajax (or refresh page if need).

i create custom page ajax request , set code

$ss = new wc_session_handler(); $ss->set('tax_total',9999999); $ss->save_data(); $ss->set('total',9999999); $ss->save_data();   var_dump(wc()); 

on page can see changes, 'checkout page' nothing happens (even after refresh). how can change arbitrary total or tax_total.

try use

add_action('woocommerce_calculate_totals', array($this, 'calculate_totals'), 10, 1);  function calculate_totals($totals){ //your code } 

also shoul tax_total in cart object , can change it.