Code-Snippets-Functions/Execute a function on a child site/WooCommerce/apply-stripe-payment-discount.txt

// 
add_action('woocommerce_cart_calculate_fees', 'apply_stripe_discount');
function apply_stripe_discount() {
    if (is_admin() && !defined('DOING_AJAX')) {
        return;
    }

    // Check if Stripe is the selected payment gateway
    if (WC()->session->get('chosen_payment_method') === 'stripe') {
        $cart_total = WC()->cart->get_cart_contents_total();
        $discount_amount = $cart_total * 0.03; // 3% discount

        // Add discount
        WC()->cart->add_fee('Stripe Discount', -$discount_amount, true);
    }
}