Payment Fee

acap.php

add_action( 'woocommerce_cart_calculate_fees', 'bbloomer_add_checkout_fee_for_gateway' );
  
function bbloomer_add_checkout_fee_for_gateway() {
    $chosen_gateway = WC()->session->get( 'chosen_payment_method' );
     if ( $chosen_gateway == 'hoolah_checkout' ) {
      global $woocommerce;
 
     if ( is_admin() && ! defined( 'DOING_AJAX' ) )
          return;

     $subtotal = $woocommerce->cart->subtotal;
     $fee_percentage = 0.08; // 2.5% percent

     $fee = number_format( round( $subtotal * $fee_percentage, 2 ), 2 ); // rounded to two decimal places to match currency formatting

     $woocommerce->cart->add_fee( 'Processing Charges 8%', $fee, true, 'standard' );
   }
}