Additional fee added does not work with Paypal express checkout method in magento2

[neha_]

I have added surcharge fee and its working fine with cash on delivery payment method but not working with paypal express checkout.

[Sunil Patel]

Hello @neha_

you need to create event for add custom amount

<event name="payment_cart_collect_items_and_amounts">
        <observer name="paypal_prepare_line_items_customercredit" instance="ModuelName\Namespace\Observer\AddAmount" />
    </event>

AddAmount.php you need to add a custom amount

namespace ModuelName\Namespace\Observer;
use Magento\Framework\Event\ObserverInterface;

class AddAmount implements ObserverInterface
{
	
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
		$cart=$observer->getEvent()->getCart();
		$cart->addCustomItem('SubCharge','1',10 );//10 means your subscharge amount
		return $this;
	
	}
}

Hope it will help you.

[neha_]

@Sunil Patel, Yes I exactly done this but the issue is Paypal's 'AMT' index is showing old amount that is without surcharge but this code update the subtotal not grand total amount of paypal.