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I have a installed module from prestashop module market called:

Promotions and discounts - (3x2, reductions, campaigns)

That have mod files in overrides folder:

PaymentModule.php

<?php
abstract class PaymentModule extends PaymentModuleCore
{
    /*
    * module: quantitydiscountpro
    * date: 2022-02-25 15:40:45
    * version: 2.1.37
    */
    public function validateOrder($id_cart, $id_order_state, $amount_paid, $payment_method = 'Unknown', $message = null, $extra_vars = array(), $currency_special = null, $dont_touch_amount = false, $secure_key = false, Shop $shop = null)
    {
        if (Module::isEnabled('quantitydiscountpro')) {
            include_once(_PS_MODULE_DIR_.'quantitydiscountpro/quantitydiscountpro.php');
            $qdpro = new QuantityDiscountRule();
            $qdpro->createAndRemoveRules();
        }
        return parent::validateOrder($id_cart, $id_order_state, $amount_paid, $payment_method, $message, $extra_vars, $currency_special, $dont_touch_amount, $secure_key, $shop);
    }
}

CartController.php

<?php
class CartController extends CartControllerCore
{
    /*
    * module: quantitydiscountpro
    * date: 2022-02-25 15:40:43
    * version: 2.1.37
    */
    protected function updateCart()
    {
        if (Module::isEnabled('quantitydiscountpro')) {
            include_once(_PS_MODULE_DIR_.'quantitydiscountpro/quantitydiscountpro.php');
            if ($this->context->cookie->exists() && !$this->errors && !($this->context->customer->isLogged() && !$this->isTokenValid())) {
                if (Tools::getIsset('add') || Tools::getIsset('update')) {
                    $this->processChangeProductInCart();
                } elseif (Tools::getIsset('delete')) {
                    $this->processDeleteProductInCart();
                } elseif (CartRule::isFeatureActive()) {
                    if (Tools::getIsset('addDiscount') || Tools::getIsset('searchcoupon')) {
                        if (!($code = trim((Tools::getValue('discount_name') ? Tools::getValue('discount_name') : Tools::getValue('coupon'))))) {
                            $this->errors[] = $this->trans('You must enter a voucher code.', array(), 'Shop.Notifications.Error');
                        } elseif (!Validate::isCleanHtml($code)) {
                            $this->errors[] = $this->trans('The voucher code is invalid.', array(), 'Shop.Notifications.Error');
                        } else {
                            $quantityDiscount = new QuantityDiscountRule();
                            if (($quantityDiscount = new quantityDiscountRule(QuantityDiscountRule::getQuantityDiscountRuleByCode($code))) && Validate::isLoadedObject($quantityDiscount)) {
                                if ($quantityDiscount->createAndRemoveRules($code) !== true) {
                                    $this->errors[] = $this->trans('The voucher code is invalid.', array(), 'Shop.Notifications.Error');
                                }
                            } elseif (($cartRule = new CartRule(CartRule::getIdByCode($code))) && Validate::isLoadedObject($cartRule)) {
                                if ($quantityDiscount->cartRuleGeneratedByAQuantityDiscountRuleCode($code)) {
                                    $this->errors[] = $this->trans('The voucher code is invalid.', array(), 'Shop.Notifications.Error');
                                } elseif ($error = $cartRule->checkValidity($this->context, false, true)) {
                                    $this->errors[] = $error;
                                } else {
                                    $this->context->cart->addCartRule($cartRule->id);
                                }
                            } else {
                                $this->errors[] = $this->trans('This voucher does not exist.', array(), 'Shop.Notifications.Error');
                            }
                        }
                    } elseif (($id_cart_rule = (int)Tools::getValue('deleteDiscount')) && Validate::isUnsignedId($id_cart_rule)) {
                        if (!QuantityDiscountRule::removeQuantityDiscountCartRule($id_cart_rule, (int)$this->context->cart->id)) {
                            $this->context->cart->removeCartRule($id_cart_rule);
                        }
                        CartRule::autoAddToCart($this->context);
                    }
                }
            } elseif (!$this->isTokenValid() && Tools::getValue('action') !== 'show' && !Tools::getValue('ajax')) {
                Tools::redirect('index.php');
            }
        } else {
            parent::updateCart();
        }
    }
}

 

I try to install:

Custom Fields

That have:

PaymentModule.php

<?php
/**
* Customfields
*
* NOTICE OF LICENSE
*
* You are not authorized to modify, copy or redistribute this file.
* Permissions are reserved by FMM Modules.
*
*  @author    FMM Modules
*  @copyright 2022 FMM Modules All right reserved
*  @license   FMM Modules
*  @package   Customfields
*/

class PaymentModule extends PaymentModuleCore
{
    /**
     * Validate an order in database
     * Function called from a payment module
     *
     * @param int $id_cart
     * @param int $id_order_state
     * @param float   $amount_paid    Amount really paid by customer (in the default currency)
     * @param string  $payment_method Payment method (eg. 'Credit card')
     * @param null    $message        Message to attach to order
     * @param array   $extra_vars
     * @param null    $currency_special
     * @param bool    $dont_touch_amount
     * @param bool    $secure_key
     * @param Shop    $shop
     *
     * @return bool
     * @throws PrestaShopException
     */
    public function validateOrder(
        $id_cart,
        $id_order_state,
        $amount_paid,
        $payment_method = 'Unknown',
        $message = null,
        $extra_vars = array(),
        $currency_special = null,
        $dont_touch_amount = false,
        $secure_key = false,
        Shop $shop = null
    )
    {
        if (false === Module::isInstalled('customfields') || false === Module::isEnabled('customfield')) {
            return parent::validateOrder(
                $id_cart,
                $id_order_state,
                $amount_paid,
                $payment_method,
                $message,
                $extra_vars,
                $currency_special,
                $dont_touch_amount,
                $secure_key,
                $shop
            );
        }

        if (self::DEBUG_MODE) {
            PrestaShopLogger::addLog('PaymentModule::validateOrder - Function called', 1, null, 'Cart', (int)$id_cart, true);
        }

        if (!isset($this->context)) {
            $this->context = Context::getContext();
        }
        $this->context->cart = new Cart((int)$id_cart);
        $this->context->customer = new Customer((int)$this->context->cart->id_customer);
        // The tax cart is loaded before the customer so re-cache the tax calculation method
        $this->context->cart->setTaxCalculationMethod();

        $this->context->language = new Language((int)$this->context->cart->id_lang);
        $this->context->shop = ($shop ? $shop : new Shop((int)$this->context->cart->id_shop));
        ShopUrl::resetMainDomainCache();
        $id_currency = $currency_special ? (int)$currency_special : (int)$this->context->cart->id_currency;
        $this->context->currency = new Currency((int)$id_currency, null, (int)$this->context->shop->id);
        if (Configuration::get('PS_TAX_ADDRESS_TYPE') == 'id_address_delivery') {
            $context_country = $this->context->country;
        }

        $order_status = new OrderState((int)$id_order_state, (int)$this->context->language->id);
        if (!Validate::isLoadedObject($order_status)) {
            PrestaShopLogger::addLog('PaymentModule::validateOrder - Order Status cannot be loaded', 3, null, 'Cart', (int)$id_cart, true);
            throw new PrestaShopException('Can\'t load Order status');
        }

        if (!$this->active) {
            PrestaShopLogger::addLog('PaymentModule::validateOrder - Module is not active', 3, null, 'Cart', (int)$id_cart, true);
            die(Tools::displayError());
        }

        // Does order already exists ?
        if (Validate::isLoadedObject($this->context->cart) && $this->context->cart->OrderExists() == false) {
            if ($secure_key !== false && $secure_key != $this->context->cart->secure_key) {
                PrestaShopLogger::addLog('PaymentModule::validateOrder - Secure key does not match', 3, null, 'Cart', (int)$id_cart, true);
                die(Tools::displayError());
            }

            // For each package, generate an order
            $delivery_option_list = $this->context->cart->getDeliveryOptionList();
            $package_list = $this->context->cart->getPackageList();
            $cart_delivery_option = $this->context->cart->getDeliveryOption();

            // If some delivery options are not defined, or not valid, use the first valid option
            foreach ($delivery_option_list as $id_address => $package) {
                if (!isset($cart_delivery_option[$id_address]) || !array_key_exists($cart_delivery_option[$id_address], $package)) {
                    foreach ($package as $key => $val) {
                        $cart_delivery_option[$id_address] = $key;
                        break;
                    }
                }
            }

            $order_list = array();
            $order_detail_list = array();

            do {
                $reference = Order::generateReference();
            } while (Order::getByReference($reference)->count());

            $this->currentOrderReference = $reference;

            $order_creation_failed = false;
            $cart_total_paid = (float)Tools::ps_round((float)$this->context->cart->getOrderTotal(true, Cart::BOTH), 2);

            foreach ($cart_delivery_option as $id_address => $key_carriers) {
                foreach ($delivery_option_list[$id_address][$key_carriers]['carrier_list'] as $id_carrier => $data) {
                    foreach ($data['package_list'] as $id_package) {
                        // Rewrite the id_warehouse
                        $package_list[$id_address][$id_package]['id_warehouse'] = (int)$this->context->cart->getPackageIdWarehouse($package_list[$id_address][$id_package], (int)$id_carrier);
                        $package_list[$id_address][$id_package]['id_carrier'] = $id_carrier;
                    }
                }
            }
            // Make sure CartRule caches are empty
            CartRule::cleanCache();
            $cart_rules = $this->context->cart->getCartRules();
            foreach ($cart_rules as $cart_rule) {
                if (($rule = new CartRule((int)$cart_rule['obj']->id)) && Validate::isLoadedObject($rule)) {
                    if ($error = $rule->checkValidity($this->context, true, true)) {
                        $this->context->cart->removeCartRule((int)$rule->id);
                        if (isset($this->context->cookie) && isset($this->context->cookie->id_customer) && $this->context->cookie->id_customer && !empty($rule->code)) {
                            if (Configuration::get('PS_ORDER_PROCESS_TYPE') == 1) {
                                Tools::redirect('index.php?controller=order-opc&submitAddDiscount=1&discount_name='.urlencode($rule->code));
                            }
                            Tools::redirect('index.php?controller=order&submitAddDiscount=1&discount_name='.urlencode($rule->code));
                        } else {
                            $rule_name = isset($rule->name[(int)$this->context->cart->id_lang]) ? $rule->name[(int)$this->context->cart->id_lang] : $rule->code;
                            $error = sprintf(Tools::displayError('CartRule ID %1s (%2s) used in this cart is not valid and has been withdrawn from cart'), (int)$rule->id, $rule_name);
                            PrestaShopLogger::addLog($error, 3, '0000002', 'Cart', (int)$this->context->cart->id);
                        }
                    }
                }
            }

            foreach ($package_list as $id_address => $packageByAddress) {
                foreach ($packageByAddress as $id_package => $package) {
                    /** @var Order $order */
                    $order = new Order();
                    $order->product_list = $package['product_list'];

                    if (Configuration::get('PS_TAX_ADDRESS_TYPE') == 'id_address_delivery') {
                        $address = new Address((int)$id_address);
                        $this->context->country = new Country((int)$address->id_country, (int)$this->context->cart->id_lang);
                        if (!$this->context->country->active) {
                            throw new PrestaShopException('The delivery address country is not active.');
                        }
                    }

                    $carrier = null;
                    if (!$this->context->cart->isVirtualCart() && isset($package['id_carrier'])) {
                        $carrier = new Carrier((int)$package['id_carrier'], (int)$this->context->cart->id_lang);
                        $order->id_carrier = (int)$carrier->id;
                        $id_carrier = (int)$carrier->id;
                    } else {
                        $order->id_carrier = 0;
                        $id_carrier = 0;
                    }

                    $order->id_customer = (int)$this->context->cart->id_customer;
                    $order->id_address_invoice = (int)$this->context->cart->id_address_invoice;
                    $order->id_address_delivery = (int)$id_address;
                    $order->id_currency = $this->context->currency->id;
                    $order->id_lang = (int)$this->context->cart->id_lang;
                    $order->id_cart = (int)$this->context->cart->id;
                    $order->reference = $reference;
                    $order->id_shop = (int)$this->context->shop->id;
                    $order->id_shop_group = (int)$this->context->shop->id_shop_group;

                    $order->secure_key = ($secure_key ? pSQL($secure_key) : pSQL($this->context->customer->secure_key));
                    $order->payment = $payment_method;
                    if (isset($this->name)) {
                        $order->module = $this->name;
                    }
                    $order->recyclable = $this->context->cart->recyclable;
                    $order->gift = (int)$this->context->cart->gift;
                    $order->gift_message = $this->context->cart->gift_message;
                    $order->mobile_theme = $this->context->cart->mobile_theme;
                    $order->conversion_rate = $this->context->currency->conversion_rate;
                    $amount_paid = !$dont_touch_amount ? Tools::ps_round((float)$amount_paid, 2) : $amount_paid;
                    $order->total_paid_real = 0;

                    $order->total_products = (float)$this->context->cart->getOrderTotal(false, Cart::ONLY_PRODUCTS, $order->product_list, $id_carrier);
                    $order->total_products_wt = (float)$this->context->cart->getOrderTotal(true, Cart::ONLY_PRODUCTS, $order->product_list, $id_carrier);
                    $order->total_discounts_tax_excl = (float)abs($this->context->cart->getOrderTotal(false, Cart::ONLY_DISCOUNTS, $order->product_list, $id_carrier));
                    $order->total_discounts_tax_incl = (float)abs($this->context->cart->getOrderTotal(true, Cart::ONLY_DISCOUNTS, $order->product_list, $id_carrier));
                    $order->total_discounts = $order->total_discounts_tax_incl;

                    $order->total_shipping_tax_excl = (float)$this->context->cart->getPackageShippingCost((int)$id_carrier, false, null, $order->product_list);
                    $order->total_shipping_tax_incl = (float)$this->context->cart->getPackageShippingCost((int)$id_carrier, true, null, $order->product_list);
                    $order->total_shipping = $order->total_shipping_tax_incl;

                    if (!is_null($carrier) && Validate::isLoadedObject($carrier)) {
                        $order->carrier_tax_rate = $carrier->getTaxesRate(new Address((int)$this->context->cart->{Configuration::get('PS_TAX_ADDRESS_TYPE')}));
                    }

                    $order->total_wrapping_tax_excl = (float)abs($this->context->cart->getOrderTotal(false, Cart::ONLY_WRAPPING, $order->product_list, $id_carrier));
                    $order->total_wrapping_tax_incl = (float)abs($this->context->cart->getOrderTotal(true, Cart::ONLY_WRAPPING, $order->product_list, $id_carrier));
                    $order->total_wrapping = $order->total_wrapping_tax_incl;

                    $order->total_paid_tax_excl = (float)Tools::ps_round((float)$this->context->cart->getOrderTotal(false, Cart::BOTH, $order->product_list, $id_carrier), _PS_PRICE_COMPUTE_PRECISION_);
                    $order->total_paid_tax_incl = (float)Tools::ps_round((float)$this->context->cart->getOrderTotal(true, Cart::BOTH, $order->product_list, $id_carrier), _PS_PRICE_COMPUTE_PRECISION_);
                    $order->total_paid = $order->total_paid_tax_incl;
                    $order->round_mode = Configuration::get('PS_PRICE_ROUND_MODE');
                    $order->round_type = Configuration::get('PS_ROUND_TYPE');

                    $order->invoice_date = '0000-00-00 00:00:00';
                    $order->delivery_date = '0000-00-00 00:00:00';

                    if (self::DEBUG_MODE) {
                        PrestaShopLogger::addLog('PaymentModule::validateOrder - Order is about to be added', 1, null, 'Cart', (int)$id_cart, true);
                    }

                    // Creating order
                    $result = $order->add();

                    if (!$result) {
                        PrestaShopLogger::addLog('PaymentModule::validateOrder - Order cannot be created', 3, null, 'Cart', (int)$id_cart, true);
                        throw new PrestaShopException('Can\'t save Order');
                    }

                    // Amount paid by customer is not the right one -> Status = payment error
                    // We don't use the following condition to avoid the float precision issues : http://www.php.net/manual/en/language.types.float.php
                    // if ($order->total_paid != $order->total_paid_real)
                    // We use number_format in order to compare two string
                    if ($order_status->logable && number_format($cart_total_paid, _PS_PRICE_COMPUTE_PRECISION_) != number_format($amount_paid, _PS_PRICE_COMPUTE_PRECISION_)) {
                        $id_order_state = Configuration::get('PS_OS_ERROR');
                    }

                    $order_list[] = $order;

                    if (self::DEBUG_MODE) {
                        PrestaShopLogger::addLog('PaymentModule::validateOrder - OrderDetail is about to be added', 1, null, 'Cart', (int)$id_cart, true);
                    }

                    // Insert new Order detail list using cart for the current order
                    $order_detail = new OrderDetail(null, null, $this->context);
                    $order_detail->createList($order, $this->context->cart, $id_order_state, $order->product_list, 0, true, $package_list[$id_address][$id_package]['id_warehouse']);
                    $order_detail_list[] = $order_detail;

                    if (self::DEBUG_MODE) {
                        PrestaShopLogger::addLog('PaymentModule::validateOrder - OrderCarrier is about to be added', 1, null, 'Cart', (int)$id_cart, true);
                    }

                    // Adding an entry in order_carrier table
                    if (!is_null($carrier)) {
                        $order_carrier = new OrderCarrier();
                        $order_carrier->id_order = (int)$order->id;
                        $order_carrier->id_carrier = (int)$id_carrier;
                        $order_carrier->weight = (float)$order->getTotalWeight();
                        $order_carrier->shipping_cost_tax_excl = (float)$order->total_shipping_tax_excl;
                        $order_carrier->shipping_cost_tax_incl = (float)$order->total_shipping_tax_incl;
                        $order_carrier->add();
                    }
                }
            }

            // The country can only change if the address used for the calculation is the delivery address, and if multi-shipping is activated
            if (Configuration::get('PS_TAX_ADDRESS_TYPE') == 'id_address_delivery') {
                $this->context->country = $context_country;
            }

            if (!$this->context->country->active) {
                PrestaShopLogger::addLog('PaymentModule::validateOrder - Country is not active', 3, null, 'Cart', (int)$id_cart, true);
                throw new PrestaShopException('The order address country is not active.');
            }

            if (self::DEBUG_MODE) {
                PrestaShopLogger::addLog('PaymentModule::validateOrder - Payment is about to be added', 1, null, 'Cart', (int)$id_cart, true);
            }

            // Register Payment only if the order status validate the order
            if ($order_status->logable) {
                // $order is the last order loop in the foreach
                // The method addOrderPayment of the class Order make a create a paymentOrder
                // linked to the order reference and not to the order id
                if (isset($extra_vars['transaction_id'])) {
                    $transaction_id = $extra_vars['transaction_id'];
                } else {
                    $transaction_id = null;
                }

                if (!isset($order) || !Validate::isLoadedObject($order) || !$order->addOrderPayment($amount_paid, null, $transaction_id)) {
                    PrestaShopLogger::addLog('PaymentModule::validateOrder - Cannot save Order Payment', 3, null, 'Cart', (int)$id_cart, true);
                    throw new PrestaShopException('Can\'t save Order Payment');
                }
            }

            // Next !
            $only_one_gift = false;
            $cart_rule_used = array();
            $products = $this->context->cart->getProducts();

            // Make sure CartRule caches are empty
            CartRule::cleanCache();
            foreach ($order_detail_list as $key => $order_detail) {
                /** @var OrderDetail $order_detail */

                $order = $order_list[$key];
                if (!$order_creation_failed && isset($order->id)) {
                    if (!$secure_key) {
                        $message .= '<br />'.Tools::displayError('Warning: the secure key is empty, check your payment account before validation');
                    }
                    // Optional message to attach to this order
                    if (isset($message) & !empty($message)) {
                        $msg = new Message();
                        $message = strip_tags($message, '<br>');
                        if (Validate::isCleanHtml($message)) {
                            if (self::DEBUG_MODE) {
                                PrestaShopLogger::addLog('PaymentModule::validateOrder - Message is about to be added', 1, null, 'Cart', (int)$id_cart, true);
                            }
                            $msg->message = $message;
                            $msg->id_cart = (int)$id_cart;
                            $msg->id_customer = (int)($order->id_customer);
                            $msg->id_order = (int)$order->id;
                            $msg->private = 1;
                            $msg->add();
                        }
                    }

                    // Insert new Order detail list using cart for the current order
                    //$orderDetail = new OrderDetail(null, null, $this->context);
                    //$orderDetail->createList($order, $this->context->cart, $id_order_state);

                    // Construct order detail table for the email
                    $products_list = '';
                    $virtual_product = true;

                    $product_var_tpl_list = array();
                    foreach ($order->product_list as $product) {
                        $price = Product::getPriceStatic((int)$product['id_product'], false, ($product['id_product_attribute'] ? (int)$product['id_product_attribute'] : null), 6, null, false, true, $product['cart_quantity'], false, (int)$order->id_customer, (int)$order->id_cart, (int)$order->{Configuration::get('PS_TAX_ADDRESS_TYPE')});
                        $price_wt = Product::getPriceStatic((int)$product['id_product'], true, ($product['id_product_attribute'] ? (int)$product['id_product_attribute'] : null), 2, null, false, true, $product['cart_quantity'], false, (int)$order->id_customer, (int)$order->id_cart, (int)$order->{Configuration::get('PS_TAX_ADDRESS_TYPE')});

                        $product_price = Product::getTaxCalculationMethod() == PS_TAX_EXC ? Tools::ps_round($price, 2) : $price_wt;

                        $product_var_tpl = array(
                            'reference' => $product['reference'],
                            'name' => $product['name'].(isset($product['attributes']) ? ' - '.$product['attributes'] : ''),
                            'unit_price' => Tools::displayPrice($product_price, $this->context->currency, false),
                            'price' => Tools::displayPrice($product_price * $product['quantity'], $this->context->currency, false),
                            'quantity' => $product['quantity'],
                            'customization' => array()
                        );

                        $customized_datas = Product::getAllCustomizedDatas((int)$order->id_cart);
                        if (isset($customized_datas[$product['id_product']][$product['id_product_attribute']])) {
                            $product_var_tpl['customization'] = array();
                            foreach ($customized_datas[$product['id_product']][$product['id_product_attribute']][$order->id_address_delivery] as $customization) {
                                $customization_text = '';
                                if (isset($customization['datas'][Product::CUSTOMIZE_TEXTFIELD])) {
                                    foreach ($customization['datas'][Product::CUSTOMIZE_TEXTFIELD] as $text) {
                                        $customization_text .= $text['name'].': '.$text['value'].'<br />';
                                    }
                                }

                                if (isset($customization['datas'][Product::CUSTOMIZE_FILE])) {
                                    $customization_text .= sprintf(Tools::displayError('%d image(s)'), count($customization['datas'][Product::CUSTOMIZE_FILE])).'<br />';
                                }

                                $customization_quantity = (int)$product['customization_quantity'];

                                $product_var_tpl['customization'][] = array(
                                    'customization_text' => $customization_text,
                                    'customization_quantity' => $customization_quantity,
                                    'quantity' => Tools::displayPrice($customization_quantity * $product_price, $this->context->currency, false)
                                );
                            }
                        }

                        $product_var_tpl_list[] = $product_var_tpl;
                        // Check if is not a virutal product for the displaying of shipping
                        if (!$product['is_virtual']) {
                            $virtual_product &= false;
                        }
                    } // end foreach ($products)

                    $product_list_txt = '';
                    $product_list_html = '';
                    if (count($product_var_tpl_list) > 0) {
                        $product_list_txt = $this->getEmailTemplateContent('order_conf_product_list.txt', Mail::TYPE_TEXT, $product_var_tpl_list);
                        $product_list_html = $this->getEmailTemplateContent('order_conf_product_list.tpl', Mail::TYPE_HTML, $product_var_tpl_list);
                    }

                    $cart_rules_list = array();
                    $total_reduction_value_ti = 0;
                    $total_reduction_value_tex = 0;
                    foreach ($cart_rules as $cart_rule) {
                        $package = array('id_carrier' => $order->id_carrier, 'id_address' => $order->id_address_delivery, 'products' => $order->product_list);
                        $values = array(
                            'tax_incl' => $cart_rule['obj']->getContextualValue(true, $this->context, CartRule::FILTER_ACTION_ALL_NOCAP, $package),
                            'tax_excl' => $cart_rule['obj']->getContextualValue(false, $this->context, CartRule::FILTER_ACTION_ALL_NOCAP, $package)
                        );

                        // If the reduction is not applicable to this order, then continue with the next one
                        if (!$values['tax_excl']) {
                            continue;
                        }

                        // IF
                        //  This is not multi-shipping
                        //  The value of the voucher is greater than the total of the order
                        //  Partial use is allowed
                        //  This is an "amount" reduction, not a reduction in % or a gift
                        // THEN
                        //  The voucher is cloned with a new value corresponding to the remainder
                        if (count($order_list) == 1 && $values['tax_incl'] > ($order->total_products_wt - $total_reduction_value_ti) && $cart_rule['obj']->partial_use == 1 && $cart_rule['obj']->reduction_amount > 0) {
                            // Create a new voucher from the original
                            $voucher = new CartRule((int)$cart_rule['obj']->id); // We need to instantiate the CartRule without lang parameter to allow saving it
                            unset($voucher->id);

                            // Set a new voucher code
                            $voucher->code = empty($voucher->code) ? Tools::substr(md5($order->id.'-'.$order->id_customer.'-'.$cart_rule['obj']->id), 0, 16) : $voucher->code.'-2';
                            if (preg_match('/\-([0-9]{1,2})\-([0-9]{1,2})$/', $voucher->code, $matches) && $matches[1] == $matches[2]) {
                                $voucher->code = preg_replace('/'.$matches[0].'$/', '-'.((int)$matches[1] + 1), $voucher->code);
                            }

                            // Set the new voucher value
                            if ($voucher->reduction_tax) {
                                $voucher->reduction_amount = ($total_reduction_value_ti + $values['tax_incl']) - $order->total_products_wt;
                                // Add total shipping amout only if reduction amount > total shipping
                                if ($voucher->free_shipping == 1 && $voucher->reduction_amount >= $order->total_shipping_tax_incl) {
                                    $voucher->reduction_amount -= $order->total_shipping_tax_incl;
                                }
                            } else {
                                $voucher->reduction_amount = ($total_reduction_value_tex + $values['tax_excl']) - $order->total_products;

                                // Add total shipping amout only if reduction amount > total shipping
                                if ($voucher->free_shipping == 1 && $voucher->reduction_amount >= $order->total_shipping_tax_excl) {
                                    $voucher->reduction_amount -= $order->total_shipping_tax_excl;
                                }
                            }
                            if ($voucher->reduction_amount <= 0) {
                                continue;
                            }

                            if ($this->context->customer->isGuest()) {
                                $voucher->id_customer = 0;
                            } else {
                                $voucher->id_customer = $order->id_customer;
                            }

                            $voucher->quantity = 1;
                            $voucher->reduction_currency = $order->id_currency;
                            $voucher->quantity_per_user = 1;
                            $voucher->free_shipping = 0;
                            if ($voucher->add()) {
                                // If the voucher has conditions, they are now copied to the new voucher
                                CartRule::copyConditions($cart_rule['obj']->id, $voucher->id);

                                $params = array(
                                    '{voucher_amount}' => Tools::displayPrice($voucher->reduction_amount, $this->context->currency, false),
                                    '{voucher_num}' => $voucher->code,
                                    '{firstname}' => $this->context->customer->firstname,
                                    '{lastname}' => $this->context->customer->lastname,
                                    '{id_order}' => $order->reference,
                                    '{order_name}' => $order->getUniqReference()
                                );
                                Mail::Send(
                                    (int)$order->id_lang,
                                    'voucher',
                                    sprintf(Mail::l('New voucher for your order %s', (int)$order->id_lang), $order->reference),
                                    $params,
                                    $this->context->customer->email,
                                    $this->context->customer->firstname.' '.$this->context->customer->lastname,
                                    null,
                                    null,
                                    null,
                                    null,
                                    _PS_MAIL_DIR_,
                                    false,
                                    (int)$order->id_shop
                                );
                            }

                            $values['tax_incl'] = $order->total_products_wt - $total_reduction_value_ti;
                            $values['tax_excl'] = $order->total_products - $total_reduction_value_tex;
                        }
                        $total_reduction_value_ti += $values['tax_incl'];
                        $total_reduction_value_tex += $values['tax_excl'];

                        $order->addCartRule($cart_rule['obj']->id, $cart_rule['obj']->name, $values, 0, $cart_rule['obj']->free_shipping);

                        if ($id_order_state != Configuration::get('PS_OS_ERROR') && $id_order_state != Configuration::get('PS_OS_CANCELED') && !in_array($cart_rule['obj']->id, $cart_rule_used)) {
                            $cart_rule_used[] = $cart_rule['obj']->id;

                            // Create a new instance of Cart Rule without id_lang, in order to update its quantity
                            $cart_rule_to_update = new CartRule((int)$cart_rule['obj']->id);
                            $cart_rule_to_update->quantity = max(0, $cart_rule_to_update->quantity - 1);
                            $cart_rule_to_update->update();
                        }

                        $cart_rules_list[] = array(
                            'voucher_name' => $cart_rule['obj']->name,
                            'voucher_reduction' => ($values['tax_incl'] != 0.00 ? '-' : '').Tools::displayPrice($values['tax_incl'], $this->context->currency, false)
                        );
                    }

                    $cart_rules_list_txt = '';
                    $cart_rules_list_html = '';
                    if (count($cart_rules_list) > 0) {
                        $cart_rules_list_txt = $this->getEmailTemplateContent('order_conf_cart_rules.txt', Mail::TYPE_TEXT, $cart_rules_list);
                        $cart_rules_list_html = $this->getEmailTemplateContent('order_conf_cart_rules.tpl', Mail::TYPE_HTML, $cart_rules_list);
                    }

                    // Specify order id for message
                    $old_message = Message::getMessageByCartId((int)$this->context->cart->id);
                    if ($old_message && !$old_message['private']) {
                        $update_message = new Message((int)$old_message['id_message']);
                        $update_message->id_order = (int)$order->id;
                        $update_message->update();

                        // Add this message in the customer thread
                        $customer_thread = new CustomerThread();
                        $customer_thread->id_contact = 0;
                        $customer_thread->id_customer = (int)$order->id_customer;
                        $customer_thread->id_shop = (int)$this->context->shop->id;
                        $customer_thread->id_order = (int)$order->id;
                        $customer_thread->id_lang = (int)$this->context->language->id;
                        $customer_thread->email = $this->context->customer->email;
                        $customer_thread->status = 'open';
                        $customer_thread->token = Tools::passwdGen(12);
                        $customer_thread->add();

                        $customer_message = new CustomerMessage();
                        $customer_message->id_customer_thread = $customer_thread->id;
                        $customer_message->id_employee = 0;
                        $customer_message->message = $update_message->message;
                        $customer_message->private = 0;

                        if (!$customer_message->add()) {
                            $this->errors[] = Tools::displayError('An error occurred while saving message');
                        }
                    }

                    if (self::DEBUG_MODE) {
                        PrestaShopLogger::addLog('PaymentModule::validateOrder - Hook validateOrder is about to be called', 1, null, 'Cart', (int)$id_cart, true);
                    }

                    // Hook validate order
                    Hook::exec('actionValidateOrder', array(
                        'cart' => $this->context->cart,
                        'order' => $order,
                        'customer' => $this->context->customer,
                        'currency' => $this->context->currency,
                        'orderStatus' => $order_status
                    ));

                    foreach ($this->context->cart->getProducts() as $product) {
                        if ($order_status->logable) {
                            ProductSale::addProductSale((int)$product['id_product'], (int)$product['cart_quantity']);
                        }
                    }

                    if (self::DEBUG_MODE) {
                        PrestaShopLogger::addLog('PaymentModule::validateOrder - Order Status is about to be added', 1, null, 'Cart', (int)$id_cart, true);
                    }

                    // Set the order status
                    $new_history = new OrderHistory();
                    $new_history->id_order = (int)$order->id;
                    $new_history->changeIdOrderState((int)$id_order_state, $order, true);
                    $new_history->addWithemail(true, $extra_vars);

                    // Switch to back order if needed
                    if (Configuration::get('PS_STOCK_MANAGEMENT') && ($order_detail->getStockState() || $order_detail->product_quantity_in_stock <= 0)) {
                        $history = new OrderHistory();
                        $history->id_order = (int)$order->id;
                        $history->changeIdOrderState(Configuration::get($order->valid ? 'PS_OS_OUTOFSTOCK_PAID' : 'PS_OS_OUTOFSTOCK_UNPAID'), $order, true);
                        $history->addWithemail();
                    }

                    unset($order_detail);

                    // Order is reloaded because the status just changed
                    $order = new Order((int)$order->id);

                    /*
                     * Getting custom fields for email
                     */
                    $customfields = $this->getCustomEmailFields($order);

                    // Send an e-mail to customer (one order = one email)
                    if ($id_order_state != Configuration::get('PS_OS_ERROR') && $id_order_state != Configuration::get('PS_OS_CANCELED') && $this->context->customer->id) {
                        $invoice = new Address((int)$order->id_address_invoice);
                        $delivery = new Address((int)$order->id_address_delivery);
                        $delivery_state = $delivery->id_state ? new State((int)$delivery->id_state) : false;
                        $invoice_state = $invoice->id_state ? new State((int)$invoice->id_state) : false;

                        $data = array(
                        '{firstname}' => $this->context->customer->firstname,
                        '{lastname}' => $this->context->customer->lastname,
                        '{email}' => $this->context->customer->email,
                        '{delivery_block_txt}' => $this->_getFormatedAddress($delivery, "\n"),
                        '{invoice_block_txt}' => $this->_getFormatedAddress($invoice, "\n"),
                        '{delivery_block_html}' => $this->_getFormatedAddress($delivery, '<br />', array(
                            'firstname'    => '<span style="font-weight:bold;">%s</span>',
                            'lastname'    => '<span style="font-weight:bold;">%s</span>'
                        )),
                        '{invoice_block_html}' => $this->_getFormatedAddress($invoice, '<br />', array(
                                'firstname'    => '<span style="font-weight:bold;">%s</span>',
                                'lastname'    => '<span style="font-weight:bold;">%s</span>'
                        )),
                        '{delivery_company}' => $delivery->company,
                        '{delivery_firstname}' => $delivery->firstname,
                        '{delivery_lastname}' => $delivery->lastname,
                        '{delivery_address1}' => $delivery->address1,
                        '{delivery_address2}' => $delivery->address2,
                        '{delivery_city}' => $delivery->city,
                        '{delivery_postal_code}' => $delivery->postcode,
                        '{delivery_country}' => $delivery->country,
                        '{delivery_state}' => $delivery->id_state ? $delivery_state->name : '',
                        '{delivery_phone}' => ($delivery->phone) ? $delivery->phone : $delivery->phone_mobile,
                        '{delivery_other}' => $delivery->other,
                        '{invoice_company}' => $invoice->company,
                        '{invoice_vat_number}' => $invoice->vat_number,
                        '{invoice_firstname}' => $invoice->firstname,
                        '{invoice_lastname}' => $invoice->lastname,
                        '{invoice_address2}' => $invoice->address2,
                        '{invoice_address1}' => $invoice->address1,
                        '{invoice_city}' => $invoice->city,
                        '{invoice_postal_code}' => $invoice->postcode,
                        '{invoice_country}' => $invoice->country,
                        '{invoice_state}' => $invoice->id_state ? $invoice_state->name : '',
                        '{invoice_phone}' => ($invoice->phone) ? $invoice->phone : $invoice->phone_mobile,
                        '{invoice_other}' => $invoice->other,
                        '{order_name}' => $order->getUniqReference(),
                        '{date}' => Tools::displayDate(date('Y-m-d H:i:s'), null, 1),
                        '{carrier}' => ($virtual_product || !isset($carrier->name)) ? Tools::displayError('No carrier') : $carrier->name,
                        '{payment}' => Tools::substr($order->payment, 0, 32),
                        '{products}' => $product_list_html,
                        '{products_txt}' => $product_list_txt,
                        '{discounts}' => $cart_rules_list_html,
                        '{discounts_txt}' => $cart_rules_list_txt,
                        '{total_paid}' => Tools::displayPrice($order->total_paid, $this->context->currency, false),
                        '{total_products}' => Tools::displayPrice(Product::getTaxCalculationMethod() == PS_TAX_EXC ? $order->total_products : $order->total_products_wt, $this->context->currency, false),
                        '{total_discounts}' => Tools::displayPrice($order->total_discounts, $this->context->currency, false),
                        '{total_shipping}' => Tools::displayPrice($order->total_shipping, $this->context->currency, false),
                        '{total_wrapping}' => Tools::displayPrice($order->total_wrapping, $this->context->currency, false),
                        '{total_tax_paid}' => Tools::displayPrice(($order->total_products_wt - $order->total_products) + ($order->total_shipping_tax_incl - $order->total_shipping_tax_excl), $this->context->currency, false),
                        '{customfields}' => $customfields,
                    );

                        if (is_array($extra_vars)) {
                            $data = array_merge($data, $extra_vars);
                        }

                        // Join PDF invoice
                        $file_attachement = array();
                        if ((int)Configuration::get('PS_INVOICE') && $order_status->invoice && $order->invoice_number) {
                            $order_invoice_list = $order->getInvoicesCollection();
                            Hook::exec('actionPDFInvoiceRender', array('order_invoice_list' => $order_invoice_list));
                            $pdf = new PDF($order_invoice_list, PDF::TEMPLATE_INVOICE, $this->context->smarty);
                            $file_attachement['content'] = $pdf->render(false);
                            $file_attachement['name'] = Configuration::get('PS_INVOICE_PREFIX', (int)$order->id_lang, null, $order->id_shop).sprintf('%06d', $order->invoice_number).'.pdf';
                            $file_attachement['mime'] = 'application/pdf';
                        } else {
                            $file_attachement = null;
                        }

                        if (self::DEBUG_MODE) {
                            PrestaShopLogger::addLog('PaymentModule::validateOrder - Mail is about to be sent', 1, null, 'Cart', (int)$id_cart, true);
                        }

                        if (Validate::isEmail($this->context->customer->email)) {
                            Mail::Send(
                                (int)$order->id_lang,
                                'order_conf',
                                Mail::l('Order confirmation', (int)$order->id_lang),
                                $data,
                                $this->context->customer->email,
                                $this->context->customer->firstname.' '.$this->context->customer->lastname,
                                null,
                                null,
                                $file_attachement,
                                null,
                                _PS_MODULE_DIR_.'customfields/mails/',//_PS_MAIL_DIR_,
                                false,
                                (int)$order->id_shop
                            );
                        }
                    }

                    // updates stock in shops
                    if (Configuration::get('PS_ADVANCED_STOCK_MANAGEMENT')) {
                        $product_list = $order->getProducts();
                        foreach ($product_list as $product) {
                            // if the available quantities depends on the physical stock
                            if (StockAvailable::dependsOnStock($product['product_id'])) {
                                // synchronizes
                                StockAvailable::synchronize($product['product_id'], $order->id_shop);
                            }
                        }
                    }

                    $order->updateOrderDetailTax();
                } else {
                    $error = Tools::displayError('Order creation failed');
                    PrestaShopLogger::addLog($error, 4, '0000002', 'Cart', (int)$order->id_cart);
                    die($error);
                }
            } // End foreach $order_detail_list

            // Use the last order as currentOrder
            if (isset($order) && $order->id) {
                $this->currentOrder = (int)$order->id;
            }

            if (self::DEBUG_MODE) {
                PrestaShopLogger::addLog('PaymentModule::validateOrder - End of validateOrder', 1, null, 'Cart', (int)$id_cart, true);
            }

            return true;
        } else {
            $error = Tools::displayError('Cart cannot be loaded or an order has already been placed using this cart');
            PrestaShopLogger::addLog($error, 4, '0000001', 'Cart', (int)$this->context->cart->id);
            die($error);
        }
    }

    protected function getCustomEmailFields($order)
    {
        if (Configuration::get('CUSTOMFIELD_CUSTOMER_EMAIL', null, $order->id_shop_group, $order->id_shop) == 1) {
            $where = 'id_cart ='.(int)$order->id_cart;
            $data = array('id_order' => (int)$order->id);
            Db::getInstance(_PS_USE_SQL_SLAVE_)->update('custom_field_userdata', $data, $where);
            $module = Module::getInstanceByName('customfields');
            return $module->getPDFFields($order->id, ' and a.show_customer = 1');
        } else {
            return false;
        }
    }
}

 

 

And the module called Product Bundle Pack|Add multiple products into the cart

have override file CartController.php

<?php
/**
 * 2007-2022 PrestaShop
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Academic Free License (AFL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/afl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to [email protected] so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to http://www.prestashop.com for more information.
 *
 * @author 2007-2022 Zh-Soft
 * @copyright Zh-Soft
 * @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0)
 *
 */

class CartController extends CartControllerCore
{
    protected function updateCart()
    {
        // Update the cart ONLY if $this->cookies are available, in order to avoid ghost carts created by bots
        if ($this->context->cookie->exists()
            && !$this->errors
            && !($this->context->customer->isLogged() && !$this->isTokenValid())
        ) {
            if (Tools::getIsset('add') || Tools::getIsset('update')) {
                if (Tools::getIsset('zhproductpackgroup')) {
                    $zh_product_pack_group = Tools::getValue('zhproductpackgroup');
                    foreach ($zh_product_pack_group as $id_product => $group) {
                        $this->qty = abs(
                            Tools::getValue('zhproductitemqty')[$id_product] * Tools::getValue('qty')
                        );
                        $this->id_product = $_POST['id_product'] = $_GET['id_product'] = $id_product;
                        $this->id_product_attribute = 0;
                        if (!isset($group[0])) {
                            $_POST['group'] = $_GET['group'] = $group;
                        } else {
                            $_POST['group'] = $_GET['group'] = null;
                        }
                        $this->processChangeProductInCart();
                    }
                    return true;
                }
            }
        }
        parent::updateCart();
    }
}