How to add another price to Opencart cart?

Question

opencart

I had to display 2 prices for the product, when you click on the "Add product" button, an ajax request is executed, the data that is passed to the request (product_id, quantity, options, .) The function that processes the request:

public function add() {
    $this->load->language('checkout/cart');
    $json = array();
    if (isset($this->request->post['product_id'])) {
      $product_id = (int)$this->request->post['product_id'];
    } else {
      $product_id = 0;
    }

    $this->load->model('catalog/product');

    $product_info = $this->model_catalog_product->getProduct($product_id);

    if ($product_info) {
      if (isset($this->request->post['quantity'])) {
        $quantity = (int)$this->request->post['quantity'];
      } else {
        $quantity = $product_info['minimum'] ? $product_info['minimum'] : 1;
      }

      if (isset($this->request->post['option'])) {
        $option = array_filter($this->request->post['option']);
      } else {
        $option = array();
      }

      $product_options = $this->model_catalog_product->getProductOptions($this->request->post['product_id']);

      foreach ($product_options as $product_option) {
        if ($product_option['required'] && empty($option[$product_option['product_option_id']])) {
          $json['error']['option'][$product_option['product_option_id']] = sprintf($this->language->get('error_required'), $product_option['name']);
        }
      }

      if (isset($this->request->post['recurring_id'])) {
        $recurring_id = $this->request->post['recurring_id'];
      } else {
        $recurring_id = 0;
      }

      $recurrings = $this->model_catalog_product->getProfiles($product_info['product_id']);

      if ($recurrings) {
        $recurring_ids = array();

        foreach ($recurrings as $recurring) {
          $recurring_ids[] = $recurring['recurring_id'];
        }

        if (!in_array($recurring_id, $recurring_ids)) {
          $json['error']['recurring'] = $this->language->get('error_recurring_required');
        }
      }

      if (!$json) {
        $this->cart->add($this->request->post['product_id'], $quantity, $option, $recurring_id);

        $json['success'] = sprintf($this->language->get('text_success'), $this->url->link('product/product', 'product_id=' . $this->request->post['product_id']), $product_info['name'], $this->url->link('checkout/cart'));

        unset($this->session->data['shipping_method']);
        unset($this->session->data['shipping_methods']);
        unset($this->session->data['payment_method']);
        unset($this->session->data['payment_methods']);

        // Totals
        $this->load->model('extension/extension');

        $total_data = array();
        $total = 0;
        $taxes = $this->cart->getTaxes();

        // Display prices
        if (($this->config->get('config_customer_price') && $this->customer->isLogged()) || !$this->config->get('config_customer_price')) {
          $sort_order = array();

          $results = $this->model_extension_extension->getExtensions('total');

          foreach ($results as $key => $value) {
            $sort_order[$key] = $this->config->get($value['code'] . '_sort_order');
          }

          array_multisort($sort_order, SORT_ASC, $results);

          foreach ($results as $result) {
            if ($this->config->get($result['code'] . '_status')) {
              $this->load->model('total/' . $result['code']);

              $this->{'model_total_' . $result['code']}->getTotal($total_data, $total, $taxes);
            }
          }

          $sort_order = array();

          foreach ($total_data as $key => $value) {
            $sort_order[$key] = $value['sort_order'];
          }

          array_multisort($sort_order, SORT_ASC, $total_data);
        }

        $json['total'] = sprintf($this->language->get('text_items'), $this->cart->countProducts() + (isset($this->session->data['vouchers']) ? count($this->session->data['vouchers']) : 0), $this->currency->format($total));
      } else {
        $json['redirect'] = str_replace('&', '&', $this->url->link('product/product', 'product_id=' . $this->request->post['product_id']));
      }
    }
    $this->response->addHeader('Content-Type: application/json');
    $this->response->setOutput(json_encode($json));
  }

How can I not find in this function where the price is being processed? can someone come across?

Answer 1

Processing is already in the cart itself:
$this->cart->add($this->request->post['product_id'], $quantity, $option, $recurring_id);
System/library/cart.php is responsible for this
What is displayed in cart.tpl is taken respectively from the cart controller catalog/controller/checkout/cart.php

Answer 2

where is the price processing

What do you mean by price processing?

Answer 3

In order for all this to work normally, it is necessary to make it possible to enter several prices at the system level, and not solve the issue with crutches