Поступила задача предоставить скику от суммы и кол-ва заказов.

Для реализации создадим файл с функцией расчета скидки

Доступ к этому контенту разрешен только участникам проекта.
Вы можете получить доступ,купив эту доработку

Добавим пересчет стоимости заказа со скидка, файл

plugins/system/onepage_generic/cart/ajaxprice.php

<?php
/**
** Parts of this code is written by joomlapro.com Copyright (c) 2012, 2015 All Right Reserved.
** Many part of this code is from VirtueMart Team Copyright (c) 2004 - 2015. All rights reserved.
** Some parts might even be Joomla and is Copyright (C) 2005 - 2014 Open Source Matters, Inc. All rights reserved. 
** http://www.gnu.org/copyleft/gpl.html GNU/GPL, see LICENSE.php
** This source is free software. This version may have been modified pursuant
** to the GNU General Public License, and as distributed it includes or 
** is derivative of works licensed under the GNU General Public License or
** other free or open source software licenses.
**
** THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY 
** KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
** PARTICULAR PURPOSE.
** <author>Joomlaproffs / Virtuemart team</author>
** <email>Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.;/email>
** <date>2017</date>
*/
defined('_JEXEC') or die('Restricted access');
include_once(JPATH_ROOT.DIRECTORY_SEPARATOR.'radfunc.php');
$cart->prepareCartData();
$i = 0; 
 foreach($cart->pricesUnformatted as $id=>$value) 
 {
 if(!is_array($value) && is_string($id)) 
 {
 continue;
 }
 $price_values["products"][$id]["subtotal_salesPrice"]=!empty($cart->pricesUnformatted[$id]["salesPrice"])?$currency->priceDisplay($cart->pricesUnformatted[$id]["salesPrice"]):"";
 $price_values["products"][$id]["subtotal_tax_amount"]=!empty($cart->pricesUnformatted[$id]["taxAmount"])?$currency->priceDisplay($cart->pricesUnformatted[$id]["taxAmount"], 0, $cart->products[$id]->quantity):"";
 $price_values["products"][$id]["subtotal_discount"]=!empty($cart->pricesUnformatted[$id]["subtotal_discount"])?$currency->priceDisplay($cart->pricesUnformatted[$id]["discountAmount"], 0, $cart->products[$id]->quantity):"";
 
 $price_values["products"][$id]["subtotal_with_tax"] = "";
 if (VmConfig::get('checkout_show_origprice',1) && !empty($cart->pricesUnformatted[$id]['basePriceWithTax']) && $cart->pricesUnformatted[$id]['basePriceWithTax'] != $cart->pricesUnformatted[$id]['salesPrice'] ) 
 {
 $old_baseprice = !empty($cart->pricesUnformatted[$id]["basePriceWithTax"])?$currency->priceDisplay($cart->pricesUnformatted[$id]["basePriceWithTax"], 0, $cart->products[$id]->quantity):"";
 $price_values["products"][$id]["subtotal_with_tax"]='<span class="line-through">'.$old_baseprice.'</span><br />';
 }
 $price_values["products"][$id]["subtotal_with_tax"] .= !empty($cart->pricesUnformatted[$id]["subtotal_with_tax"])?$currency->priceDisplay($cart->pricesUnformatted[$id]["subtotal_with_tax"]):"";
 $i++; 
 if(count($cart->products) == $i)
 {
 break;
 }
 continue;
 }

//изменение стоимости на группу
 $user = JFactory::getUser(); 
 $rad_discount_sum=get_raddicount($user->id,$cart->pricesUnformatted["billTotal"]); 
 $cart->pricesUnformatted["billTotal"]=$cart->pricesUnformatted["billTotal"]*1-$rad_discount_sum;
 $price_values["discountname"]=$_SESSION['rad_discount_name'];

 $priceList = array("salesPrice","salesPriceShipment","paymentTax","shipmentTax","billTaxAmount","discountAmount","salesPriceCoupon","salesPricePayment","couponTax","taxAmount","billTotal","billDiscountAmount");
 
 if(!empty($cart->couponCode)) $price_values["couponCode"]= $cart->couponCode;
 
 
 foreach ($priceList as $price_name) {
 if(!empty($cart->pricesUnformatted[$price_name])) $price_values[$price_name] = $currency->priceDisplay($cart->pricesUnformatted[$price_name]);
 else $price_values[$price_name] = "";
 }
 $price_values["couponDescr"] = "";
 $price_values["couponCode"] = "";
 
 if(!empty($cart->cartData["couponCode"]))
 $price_values["couponCode"] = $cart->cartData["couponCode"];
 
 if(!empty($cart->cartData["couponDescr"]))
 $price_values["couponDescr"] = $cart->cartData["couponDescr"];
 
 $price_values["billTotalunformat"]= $cart->pricesUnformatted["billTotal"];
if(count($this->cart->cartData['taxRulesBill']) > 0)
 {
 $taxRulesBill = array();
 foreach($this->cart->cartData['taxRulesBill'] as $rule)
 {
 $virtuemart_calc_id = $rule['virtuemart_calc_id'];
 $calcname = $rule['calc_name'];
 $taxRulesBill[$virtuemart_calc_id]["name"] = $calcname;
 $taxRulesBill[$virtuemart_calc_id]["price"] = $this->currencyDisplay->createPriceDiv($rule['virtuemart_calc_id'].'Diff','', $this->cart->pricesUnformatted[$rule['virtuemart_calc_id'].'Diff'],true);
 }
 $price_values["taxRulesBill"] = $taxRulesBill;
 }
if(count($this->cart->cartData['DATaxRulesBill']) > 0)
 {
 $DATaxRulesBill = array();
 foreach($this->cart->cartData['DATaxRulesBill'] as $rule)
 {
 $virtuemart_calc_id = $rule['virtuemart_calc_id'];
 $calcname = $rule['calc_name'];
 $DATaxRulesBill[$virtuemart_calc_id]["name"] = $calcname;
 $DATaxRulesBill[$virtuemart_calc_id]["price"] = $this->currencyDisplay->createPriceDiv($rule['virtuemart_calc_id'].'Diff','', $this->cart->pricesUnformatted[$rule['virtuemart_calc_id'].'Diff'],true);
 }
 $price_values["DATaxRulesBill"] = $DATaxRulesBill;
 }
if(count($this->cart->cartData['DBTaxRulesBill']) > 0)
 {
$DBTaxRulesBill = array();
 foreach($this->cart->cartData['DBTaxRulesBill'] as $rule)
 {
 $virtuemart_calc_id = $rule['virtuemart_calc_id'];
 $calcname = $rule['calc_name'];
 $DBTaxRulesBill[$virtuemart_calc_id]["name"] = $calcname;
 $DBTaxRulesBill[$virtuemart_calc_id]["price"] = $this->currencyDisplay->createPriceDiv($rule['virtuemart_calc_id'].'Diff','', $this->cart->pricesUnformatted[$rule['virtuemart_calc_id'].'Diff'],true);
 }
 $price_values["DBTaxRulesBill"] = $DBTaxRulesBill;
 }echo json_encode($price_values);
 exit;
?>

В файле шаблон цен нужно добаить элемент для вывода названия скидки

plugins/system/onepage_generic/cart/tmpl/default_price.php

<?php
if (isset($_SESSION['rad_discount_name'])) $disname=$_SESSION['rad_discount_name']; else $disname='';
 ?>
 <div class="total opg-grid opg-text-right" id="bill_totalfulldiv">
 <div class="price-type opg-width-large-3-4 opg-width-small-1-2 opg-width-1-2 opg-text-large opg-text-primary opg-text-bold"><?php echo JText::_('COM_VIRTUEMART_CART_TOTAL').': ' ?></div>
 <div class="price-amount opg-width-large-1-4 opg-width-small-1-2 opg-width-1-2 opg-text-large opg-text-primary opg-text-bold" id="bill_total"><?php echo $this->currencyDisplay->createPriceDiv('billTotal','', $this->cart->pricesUnformatted['billTotal'],true); ?></div>
 <div class="price-amount opg-width-large-3-4 opg-width-small-1-2 opg-width-1-2 opg-text-large opg-text-primary opg-text-bold" id="bill_total_discountname"><?php echo $disname; ?></div>
 <div class="clear"></div>
 </div>

Добавим вывод подписи при перерасчете чека - на форме  должен быть элемент с тегом #bill_total_discountname

plugins/system/onepage_generic/onepage.js

if(data.billTotal != "")
 {
 jQuery("#bill_totalamountfulldiv").show();
 jQuery("#bottom_total").show();
 jQuery('#bill_total').html(data.billTotal);
 jQuery('#bill_total_discountname').html(data.discountname);
 jQuery('#carttotal').html(data.billTotal);
 jQuery('#carttotalunformat').val(data.billTotalunformat);
 }
 else
 {
 jQuery("#bill_totalamountfulldiv").hide();
 jQuery("#bottom_total").hide();
 }

Далее нужно повторить скидку в момент создания заказа в базе

components/virtuemart/helper/cart.php

Доступ к этому контенту разрешен только участникам проекта.
Вы можете получить доступ,купив эту доработку

 Необходимо также в стандартном и всех остлальных плагинах оплаты выключить оповещение покупателя - потому что покупателю придет письмо без скидки.

/plugins/vmpayment/standard/standard.php

function plgVmConfirmedOrder ($cart, $order) {function plgVmConfirmedOrder ($cart, $order) {
 if (!($method = $this->getVmPluginMethod ($order['details']['BT']->virtuemart_paymentmethod_id))) { return NULL; // Another method was selected, do nothing } if (!$this->selectedThisElement ($method->payment_element)) { return FALSE; }
 vmLanguage::loadJLang('com_virtuemart',true); vmLanguage::loadJLang('com_virtuemart_orders', TRUE);
 $this->getPaymentCurrency($method, $order['details']['BT']->payment_currency_id); $currency_code_3 = shopFunctions::getCurrencyByID($method->payment_currency, 'currency_code_3'); $email_currency = $this->getEmailCurrency($method);
 $totalInPaymentCurrency = vmPSPlugin::getAmountInCurrency($order['details']['BT']->order_total,$method->payment_currency);
 if (!empty($method->payment_info)) { $lang = JFactory::getLanguage (); if ($lang->hasKey ($method->payment_info)) { $method->payment_info = vmText::_ ($method->payment_info); } }
 $dbValues['payment_name'] = $this->renderPluginName ($method) . '<br />' . $method->payment_info; $dbValues['order_number'] = $order['details']['BT']->order_number; $dbValues['virtuemart_paymentmethod_id'] = $order['details']['BT']->virtuemart_paymentmethod_id; $dbValues['cost_per_transaction'] = $method->cost_per_transaction; $dbValues['cost_min_transaction'] = $method->cost_min_transaction; $dbValues['cost_percent_total'] = $method->cost_percent_total; $dbValues['payment_currency'] = $currency_code_3; $dbValues['email_currency'] = $email_currency; $dbValues['payment_order_total'] = $totalInPaymentCurrency['value']; $dbValues['tax_id'] = $method->tax_id; //вставляем скидку if (isset($_SESSION['rad_dicount_total']) and $_SESSION['rad_dicount_total']*1>0) { $rad_discount_sum=$_SESSION['rad_dicount_total']*1; $order['details']['BT']->order_total=$order['details']['BT']->order_total*1-$rad_discount_sum*1; $order['details']['BT']->order_salesPrice=$order['details']['BT']->order_salesPrice*1-$rad_discount_sum*1; $order['details']['BT']->order_subtotal=$order['details']['BT']->order_subtotal*1-$rad_discount_sum*1; $order['details']['BT']->order_billDiscountAmount=$order['details']['BT']->order_billDiscountAmount*1+$rad_discount_sum*1; $order['details']['BT']->order_discountAmount=$order['details']['BT']->order_discountAmount*1+$rad_discount_sum*1; $_SESSION['rad_dicount_total']=''; $_SESSION['rad_dicount_name']=''; } $this->storePSPluginInternalData ($dbValues);
 $currency = CurrencyDisplay::getInstance ('', $order['details']['BT']->virtuemart_vendor_id);

 $modelOrder = VmModel::getModel ('orders'); 
$order['order_status'] = $this->getNewStatus ($method); 
$order['customer_notified'] = 0; 
$order['comments'] = ''; 
 $modelOrder->updateStatusForOneOrder ($order['details']['BT']->virtuemart_order_id, $order, TRUE);
 $orderlink=''; $tracking = VmConfig::get('ordertracking','guests'); if($tracking !='none' and !($tracking =='registered' and empty($order['details']['BT']->virtuemart_user_id) )) {
 $orderlink = 'index.php?option=com_virtuemart&view=orders&layout=details&order_number=' . $order['details']['BT']->order_number; if ($tracking == 'guestlink' or ($tracking == 'guests' and empty($order['details']['BT']->virtuemart_user_id))) { $orderlink .= '&order_pass=' . $order['details']['BT']->order_pass; } }
 $html = $this->renderByLayout('post_payment', array( 'order_number' =>$order['details']['BT']->order_number, 'order_pass' =>$order['details']['BT']->order_pass, 'payment_name' => $dbValues['payment_name'], 'displayTotalInPaymentCurrency' => $totalInPaymentCurrency['display'], 'orderlink' =>$orderlink ));
 //We delete the old stuff $cart->emptyCart (); vRequest::setVar ('html', $html); return TRUE; }