Add a surcharge to the cart and checkout

gistfile1.php

/**
 * Add a 1% surcharge to your cart / checkout
 * change the $percentage to set the surcharge to a value to suit
 * Uses the WooCommerce fees API
 *
 * Add to theme functions.php
 */
add_action( 'woocommerce_cart_calculate_fees','woocommerce_custom_surcharge' );
function woocommerce_custom_surcharge() {
  global $woocommerce;

	if ( is_admin() && ! defined( 'DOING_AJAX' ) )
		return;

	$percentage = 0.01;
	$surcharge = ( $woocommerce->cart->cart_contents_total + $woocommerce->cart->shipping_total ) * $percentage;	
	$woocommerce->cart->add_fee( 'Surcharge', $surcharge, true, '' );

}

Hi Everyone,

The reason this is happening is due to a rounding error - PayPal can only accept 2 decimal places for the surcharge.

Below is the code that worked for me:

/**
 * Add a 1% surcharge to your cart / checkout
 * change the $percentage to set the surcharge to a value to suit
 * Uses the WooCommerce fees API
 *
 * Add to theme functions.php
 */
add_action( 'woocommerce_cart_calculate_fees','woocommerce_custom_surcharge' );
function woocommerce_custom_surcharge() {
  global $woocommerce;

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    $percentage = 0.01;
    $surcharge = ( $woocommerce->cart->cart_contents_total + $woocommerce->cart->shipping_total ) * $percentage;    
    $surcharge = round( $surcharge, 2 );

    $woocommerce->cart->add_fee( 'Surcharge', $surcharge, true, 'standard' );

}

Hi, thanks for this snippet.
Is it possible to add the fee based on the chosen payment method?

Corrected to remove 'standard' from add_fee based on woocommerce/woocommerce#6808

Where do i post this code ?

How would I make the fee/surcharge populate based on a minimum cart total amount...say $500...?

Was anyone able to find an answer to not have the surcharge be added to one product at all? I want it added to all products exept one of them. Thanks in advance.