/**
 * Restaure la transaction dans le panier WooCommerce
 * Endpoint: ?miassar_restore=1&transaction=XXX&token=YYY
 */
public function restore_transaction_to_cart() {
    if (!isset($_GET['miassar_restore']) || !isset($_GET['transaction']) || !isset($_GET['token'])) {
        return;
    }
    
    // Vérifier WooCommerce
    if (!$this->wc_ready()) {
        wp_die('Le système de paiement n\'est pas disponible.');
    }
    
    $transaction_id = sanitize_text_field($_GET['transaction']);
    $token = sanitize_text_field($_GET['token']);
    
    global $wpdb;
    $transaction = $wpdb->get_row($wpdb->prepare(
        "SELECT * FROM {$this->table_name} WHERE transaction_id = %s",
        $transaction_id
    ));
    
    if (!$transaction) {
        wp_die('Transaction introuvable.');
    }
    
    // Vérifier le token
    $salt = defined('AUTH_SALT') ? AUTH_SALT : 'miassar_default_salt';
    $expected_token = hash('sha256', $transaction_id . $transaction->security_code . $salt . date('Y-m-d'));
    if (!hash_equals($expected_token, $token)) {
        wp_die('Lien de paiement invalide.');
    }
    
    // Vérifier le statut
    if ($transaction->status === 'paid') {
        wp_die('Cette transaction a déjà été réglée.');
    }
    
    // Récupérer ou créer le produit
    $product_id = $transaction->product_id;
    if (!$product_id || !wc_get_product($product_id)) {
        // Créer un nouveau produit
        $product = new WC_Product_Simple();
        $product->set_name($transaction->product_name . ' - Miassar');
        $product->set_price($transaction->total_amount);
        $product->set_regular_price($transaction->total_amount);
        $product->set_virtual(true);
        $product->set_catalog_visibility('hidden');
        $product->set_status('publish');
        $product->update_meta_data('_miassar_transaction', $transaction_id);
        $product_id = $product->save();
        
        // Mettre à jour la transaction
        $wpdb->update(
            $this->table_name,
            array('product_id' => $product_id),
            array('transaction_id' => $transaction_id)
        );
    }
    
    // Restaurer le panier
    WC()->cart->empty_cart();
    WC()->cart->add_to_cart($product_id, 1);
    
    // Rediriger vers le checkout
    wp_safe_redirect(wc_get_checkout_url());
    exit;
}
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /var/www/html/wordpress/wp-content/plugins/miassar-payment-system/includes/class-transaction.php:909) in <b>/var/www/html/wordpress/wp-includes/pluggable.php</b> on line <b>1535</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /var/www/html/wordpress/wp-content/plugins/miassar-payment-system/includes/class-transaction.php:909) in <b>/var/www/html/wordpress/wp-includes/pluggable.php</b> on line <b>1538</b><br />