This WordPress plugin adds settings to all WooCommerce gateways to add a fixed and/or variable (percentage) fee.
This WordPress plugin adds settings to all WooCommerce gateways to add a fixed and/or variable (percentage) fee.
composer require pronamic/pronamic-payment-gateways-fees-for-woocommerce
\Pronamic\WooCommercePaymentGatewaysFees\Plugin::instance()->setup();
WooCommerce recommends using the woocommerce_cart_calculate_fees hook to add fees:
We suggest using the action woocommerce_cart_calculate_fees hook for adding fees.
This hook is called as soon as the WC()->cart->calculate_totals() function is called, WooCommerce uses the WC_Cart_Totals class to calculate totals:
class-wc-cart.php
/**
* Calculate totals for the items in the cart.
*
* @uses WC_Cart_Totals
*/
public function calculate_totals() {
$this->reset_totals();
if ( $this->is_empty() ) {
$this->session->set_session();
return;
}
do_action( 'woocommerce_before_calculate_totals', $this );
new WC_Cart_Totals( $this );
do_action( 'woocommerce_after_calculate_totals', $this );
}When creating a WC_Cart_Totals instance, the WC_Cart_Totals->calculate() function is executed:
class-wc-cart-totals.php
/**
* Run all calculation methods on the given items in sequence.
*
* @since 3.2.0
*/
protected function calculate() {
$this->calculate_item_totals();
$this->calculate_shipping_totals();
$this->calculate_fee_totals();
$this->calculate_totals();
}What can be seen here is that the final totals are calculated after calculating the fee totals. This means that the order total is not yet available within the woocommerce_cart_calculate_fees hook. In other words, within the woocommerce_cart_calculate_fees hook the result of $cart->get_total( '' ) will always be 0.
This is inconvenient because the payment gateway fees are often based on the total amount to be paid. That's why we hook into the woocommerce_after_calculate_totals hook and recalculate the totals again. This extra calculation seems double, but it seems to be the easiest way to reliably request the cart total.
