How to change final order total with overriding Cart.php ?

[Codify Solutions]

Hello Everyone,

 

I have a problem to changing order total. What I did I put Cart.php on override folder and put getOrderTotal function there.

I want to add suppose $10 on final total means Total after Tax ( Grand Total ).

 

I put my code before

return Tools::ps_round((float)$order_total, $compute_precision);

 

I added

if ( my condition ) {

  $order_total += $myvalue;

}

 

In this getOrderTotal function it goes many times I think whenever getOrderTotal calls on payment page.
 

but it add that amount on Total products not the final amount, so when I proceed with the order it won't change the final amount of the order.

 

Please help. Thanks !

 

 

[ZiedDams]

any new ?, thank you