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

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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 !



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