Adding fee based on the cart total

You can use:

function woo_add_cart_fee( $cart ) {
    $cart_total = $cart->cart_contents_total;
    $fee = (int)$cart_total*5/100;
    WC()->cart->add_fee( 'Credits :', $fee, false, '' );
}

add_action( 'woocommerce_cart_calculate_fees', 'woo_add_cart_fee' );

Can I get tax applied total.? in $cart_total .?

You can make the fee taxable by saying true on the 3rd arg:

WC()->cart->add_fee( 'Credits :', $fee, true, '' );

Actually, can I get the cart taxes and shipping total here?

From the WC()->cart class you can. Look in the class to see what is available https://github.com/woothemes/woocommerce/blob/2.5.5/includes/class-wc-cart.php#L73

Hi Mike,

We used the above code in a similar fashion and was able to get it taxable. Do you have any idea how we could get the coupon and shipping calculations to include this added fee as well? For example, with the above code, if we apply a 100% off coupon to the cart the added fee is still there but we want it to go to $0. The code I am working with is pasted below for reference.

Kirby

add_action( 'woocommerce_cart_calculate_fees', 'woo_add_cart_fee' );
function woo_add_cart_fee() {

global $woocommerce;

$qtytotal = 0;
$cnt = 0;
$curr_cost = 0;
foreach ($woocommerce->cart->get_cart() as $item) {

$qty = $item['quantity'];
$cost = get_post_meta($item['product_id'], 'customer_wants_tea_bag', false);

if (!empty($cost)) {
$qtytotal = $qty + $qtytotal;
$curr_cost = $cost[0];
}
}
$woocommerce->cart->add_fee( __('Packing', 'woocommerce'), $qtytotal * 6, TRUE);
}