Deposit based on a percentage of total cart amount

I've taken this code from another post and basically from my understanding, this code is trying to force the cart price to change to a fixed amount of $40 and charge it as a booking fee.

What I want to do is force the cart amount to be 20% of what the total would be based on adding up all the products in the cart. My site is for reservations, so I only want to charge a deposit and then have them pay when they use their reservation.

Here is the code from this post: Woocommerce cart deposit

add_action( 'woocommerce_cart_calculate_fees', 'booking_fee' );
function booking_fee() {
    global $woocommerce;

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

    $bookingfee_array = array( '2434' );

    $fixed = 40.00;

    foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $values ) {

        if( in_array( $values['product_id'], $bookingfee_array ) ) {
            $surcharge = $fixed;
            $woocommerce->cart->add_fee( 'Broneeringutasu', $surcharge, true, '' );
        }

    }

}

And here is how I would change it:

add_action( 'woocommerce_cart_calculate_fees', 'booking_fee' );
function booking_fee() {
    global $woocommerce;

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

    $bookingfee_array = array( '2434' );

    $percent = .20;

    foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $values ) {

        if( in_array( $values['product_id'], $bookingfee_array ) ) {
            $surcharge = $percent;
            $woocommerce->cart->add_fee( 'Booking Fee', $surcharge, true, '' );
        }

    }

}

But this is not working as expected.

Any help on this?

Thanks

Your code is not really going to do what you expect, as you are adding a fee of o.2 to total cart amount. So if the cart amount is 100, the grand total is going to be 100.2…

What you want to do instead, is to remove 80% of total cart amount to get a cart amount of 20%. This is possible using a negative fee of 80% from total cart amount. If you don't need to set targeted products IDs as in your original code, use the 2nd function below.

Here is the first function that will remove 80% of total cart amount when a cart item match with the targeted product IDs set in the function:

add_action( 'woocommerce_cart_calculate_fees', 'booking_deposit_calculation' );
function booking_deposit_calculation( $cart_object ) {

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

    ## Set HERE your targeted products IDs
    $target_product_ids = array( 2434 );

    ## Set HERE your negative percentage (to remove an amount from cart total)
    $percent = -.80; // 80% off (negative)

    $matching = false;

    // Iterating through each cart items
    foreach ( $cart_object->get_cart() as $item_values )
    {
        if( in_array( $item_values['product_id'], $target_product_ids ) )
        { // If a cart item match with a targeted product ID

            // Get cart subtotal excluding taxes
            $cart_subtotal = $cart_object->subtotal_ex_tax;
            // or for subtotal including taxes use instead:
            // $cart_subtotal = $cart_object->subtotal;

            ## ## CALCULATION ## ##
            $calculated_amount = $cart_subtotal * $percent;

            // Adding a negative fee to cart amount (Including taxes)
            $cart_object->add_fee( __('Deposit calculation', 'woocommerce'), $calculated_amount, true );

            break; // We stop the loop
        }
    }
}

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

---

But may be you don't need to have some targeted products as in the original code.

If it's the case this simplify the code:

add_action( 'woocommerce_cart_calculate_fees', 'booking_deposit_calculation' );
function booking_deposit_calculation( $cart_object ) {

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

    ## Set HERE your negative percentage (to remove an amount from cart total)
    $percent = -.80; // 80% off (negative)

    // Get cart subtotal excluding taxes
    $cart_subtotal = $cart_object->subtotal_ex_tax;
    // or for subtotal including taxes use instead:
    // $cart_subtotal = $cart_object->subtotal;

    ## ## CALCULATION ## ##
    $calculated_amount = $cart_subtotal * $percent;

    // Adding a negative fee to cart amount (Including taxes)
    $cart_object->add_fee( __('Deposit calculation', 'woocommerce'), $calculated_amount, true );

}

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

Both functions are tested and works