1. 购物车(shopping cart)
2. [货运方式(delivery method)]
3. 支付方式(payment method)
4. 订单确认(confirmation)
5. [第三方网站支付]
6. 订单处理(checkout process)——这一步比较重要，因为会在这里将购物车中的信息写入订单
7. 下单成功(checkout success)
这样的流程在正常情况下是没有任何问题的。但是，从第5步到第6部的过程中，用户可能以为付款成功就直接关闭掉网页了，或者由于网络原因造成不能正常跳转到checkout_process页面，这样造成的后果是很严重的，因为订单不能被正常的创建。
基于上述的分析， 我们希望稍微地改变一下流程，即在支付之前订单已经创建好了，这样就算在支付时不能从第三方支付网站跳转回来，我们也不会存在用户付款成功却在后台没有订单的情况了。经过修改后的蓝图基本是下面这样的：
1. 在checkour_confirmation页面确认订单后，都会直接proccess，并且进入checkour_success页面,可以在这里进入付款页面。如下图所示：
2. 如果当时客户没能付款，也可进入自己的后台对历史订单进行付款。如下图所示：
下面我们就来看看如何一步一步来实现上述的功能。
1. 首先我们需要对现有的支付模块进行一个改造。需要对支付方式的class增加一个字段paynow_action_url，用来表示进行支付的页面url，另外还需要增加一个函数，paynow_button($order_id)，来获取支付表单的参数隐藏域代码。
要增加paynow_action_url字段，请在类payment的构造函数中最后加上下面的代码：
if ( (zen_not_null($module)) && (in_array($module.'.php', $this->modules)) && (isset($globals[$module]->paynow_action_url)) ) { $this->paynow_action_url = $globals[$module]->paynow_action_url; }
要增加paynow_button($order_id)函数，请在payment类的最后一个函数之后加上如下的代码：
function paynow_button($order_id){ if (is_array($this->modules)) { if (is_object($globals[$this->selected_module])) { return $globals[$this->selected_module]->paynow_button($order_id); } } }
2. 以paypal支付方式为例子，说明如何具体实现。为了不破坏paypal原有的代码，我们将paypal.php文件拷贝一个副本出来，并命名为paypalsimple.php，并对里面的代码做适当的修改。代码如下所示，可以看到，这里去掉了对form_action_url的指定，并给定了paynow_action_url，因为我们希望用户点击“确认订单”后直接进入checkout_process，所以如果不指定form_action_url，那么确认订单的表单就会直接提交到checkout_process页面了，而paynow_action_url就是以前的form_action_url的值。paynow_button函数的实现也很简单，这里只是将原先的process_button()函数的内容剪切过来而已，只不过我们没有使用全局的$order变量，而是使用$order = new order($order_id),来重新构造的一个对象，这样做是为在历史订单中显示pay now按钮做准备的。
paypalsimple.php
<?php /** * @package paypalsimple payment module * @copyright copyright 2003-2006 zen cart development team * @copyright portions copyright 2003 oscommerce * @license http://www.zen-cart.com/license/2_0.txt gnu public license v2.0 * @version $id: paypalsimple.php 4960 2009-12-29 11:46:46z gary $ */ // ensure dependencies are loaded include_once((is_admin_flag === true ? dir_fs_catalog_modules : dir_ws_modules) . 'payment/paypal/paypal_functions.php'); class paypalsimple { var $code, $title, $description, $enabled; // class constructor function paypalsimple() { global $order; $this->code = 'paypalsimple'; $this->title = module_payment_paypal_simple_text_title; if(is_admin_flag === true){ $this->title = module_payment_paypal_simple_text_admin_title; } $this->description = module_payment_paypal_simple_text_description; $this->sort_order = module_payment_paypal_simple_sort_order; $this->enabled = ((module_payment_paypal_simple_status == 'true') ? true : false); if ((int)module_payment_paypal_simple_order_status_id > 0) { $this->order_status = module_payment_paypal_simple_order_status_id; } $this->paynow_action_url = 'https://' . module_payment_paypal_simple_handler; if (is_object($order)) $this->update_status(); } // class methods function update_status() { global $order, $db; if ( ($this->enabled == true) && ((int)module_payment_paypal_simple_zone > 0) ) { $check_flag = false; $check = $db->execute("select zone_id from " . table_zones_to_geo_zones . " where geo_zone_id = '" . module_payment_paypal_simple_zone . "' and zone_country_id = '" . $order->billing['country']['id'] . "' order by zone_id"); while (!$check->eof) { if ($check->fields['zone_id'] < 1) { $check_flag = true; break; } elseif ($check->fields['zone_id'] == $order->billing['zone_id']) { $check_flag = true; break; } $check->movenext(); } if ($check_flag == false) { $this->enabled = false; } } } function javascript_validation() { return false; } function selection() { $text = module_payment_simple_paypal_text_catalog_logo.' '.module_payment_paypal_simple_text_title . '<br/><br/> <span class="smalltext">' . module_payment_paypal_simple_acceptance_mark_text . '</span><br/><br/>'; return array('id' => $this->code, 'module' => $text ); } function pre_confirmation_check() { return false; } function confirmation() { return false; } function process_button() { return false; } function before_process() { return false; } function after_process() { return false; } function get_error() { return false; } function check() { global $db; if (!isset($this->_check)) { $check_query = $db->execute("select configuration_value from " . table_configuration . " where configuration_key = 'module_payment_paypal_simple_status'"); $this->_check = $check_query->recordcount(); } return $this->_check; } function install() { global $db; $db->execute("insert into " . table_configuration . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('enable paypal-simple module', 'module_payment_paypal_simple_status', 'true', 'do you want to accept paypal-simple payments?', '6', '0', 'zen_cfg_select_option(array(\'true\', \'false\'), ', now())"); $db->execute("insert into " . table_configuration . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added) values ('sort order of display.', 'module_payment_paypal_simple_sort_order', '0', 'sort order of display. lowest is displayed first.', '6', '8', now())"); $db->execute("insert into " . table_configuration . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, use_function, set_function, date_added) values ('payment zone', 'module_payment_paypal_simple_zone', '0', 'if a zone is selected, only enable this payment method for that zone.', '6', '2', 'zen_get_zone_class_title', 'zen_cfg_pull_down_zone_classes(', now())"); $db->execute("insert into " . table_configuration . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, use_function, date_added) values ('set order status', 'module_payment_paypal_simple_order_status_id', '0', 'set the status of orders made with this payment module to this value', '6', '0', 'zen_cfg_pull_down_order_statuses(', 'zen_get_order_status_name', now())"); $db->execute("insert into " . table_configuration . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('mode for paypal web services<br /><br />default:<br /><code>www.paypal.com/cgi-bin/webscr</code><br />or<br /><code>www.paypal.com/us/cgi-bin/webscr</code><br />or for the uk,<br /><code>www.paypal.com/uk/cgi-bin/webscr</code>', 'module_payment_paypal_simple_handler', 'www.paypal.com/cgi-bin/webscr', 'choose the url for paypal live processing', '6', '73', '', now())"); } function remove() { global $db; $db->execute("delete from " . table_configuration . " where configuration_key in ('" . implode("', '", $this->keys()) . "')"); } function keys() { return array('module_payment_paypal_simple_status','module_payment_paypal_simple_sort_order','module_payment_paypal_simple_zone','module_payment_paypal_simple_order_status_id', 'module_payment_paypal_simple_handler'); } function paynow_button($order_id){ global $db, $order, $currencies, $currency; require_once(dir_ws_classes . 'order.php'); $order = new order($order_id); $options = array(); $optionscore = array(); $optionsphone = array(); $optionsship = array(); $optionslineitems = array(); $optionsaggregate = array(); $optionstrans = array(); $buttonarray = array(); $this->totalsum = $order->info['total']; // save the session stuff permanently in case paypal loses the session $_session['ppipn_key_to_remove'] = session_id(); $db->execute("delete from " . table_paypal_session . " where session_id = '" . zen_db_input($_session['ppipn_key_to_remove']) . "'"); $sql = "insert into " . table_paypal_session . " (session_id, saved_session, expiry) values ( '" . zen_db_input($_session['ppipn_key_to_remove']) . "', '" . base64_encode(serialize($_session)) . "', '" . (time() + (1*60*60*24*2)) . "')"; $db->execute($sql); $my_currency = select_pp_currency(); $this->transaction_currency = $my_currency; $this->transaction_amount = ($this->totalsum * $currencies->get_value($my_currency)); $telephone = preg_replace('/\d/', '', $order->customer['telephone']); if ($telephone != '') { $optionsphone['h_phonenumber'] = $telephone; if (in_array($order->customer['country']['iso_code_2'], array('us','ca'))) { $optionsphone['night_phone_a'] = substr($telephone,0,3); $optionsphone['night_phone_b'] = substr($telephone,3,3); $optionsphone['night_phone_c'] = substr($telephone,6,4); $optionsphone['day_phone_a'] = substr($telephone,0,3); $optionsphone['day_phone_b'] = substr($telephone,3,3); $optionsphone['day_phone_c'] = substr($telephone,6,4); } else { $optionsphone['night_phone_b'] = $telephone; $optionsphone['day_phone_b'] = $telephone; } } $optionscore = array( 'charset' => charset, 'lc' => $order->customer['country']['iso_code_2'], 'page_style' => module_payment_paypal_page_style, 'custom' => zen_session_name() . '=' . zen_session_id(), 'business' => module_payment_paypal_business_id, 'return' => zen_href_link(filename_pay_success, 'referer=paypal', 'ssl'), 'cancel_return' => zen_href_link(filename_pay_failed, '', 'ssl'), 'shopping_url' => zen_href_link(filename_shopping_cart, '', 'ssl'), 'notify_url' => zen_href_link('ipn_main_handler.php', '', 'ssl',false,false,true), 'redirect_cmd' => '_xclick', 'rm' => 2, 'bn' => 'zencart', 'mrb' => 'r-6c7952342h795591r', 'pal' => '9e82wjbkkgplq', ); $optionscust = array( 'first_name' => replace_accents($order->customer['firstname']), 'last_name' => replace_accents($order->customer['lastname']), 'address1' => replace_accents($order->customer['street_address']), 'city' => replace_accents($order->customer['city']), 'state' => zen_get_zone_code($order->customer['country']['id'], $order->customer['zone_id'], $order->customer['zone_id']), 'zip' => $order->customer['postcode'], 'country' => $order->customer['country']['iso_code_2'], 'email' => $order->customer['email_address'], ); if ($order->customer['suburb'] != '') $optionscust['address2'] = $order->customer['suburb']; if (module_payment_paypal_address_required == 2) $optionscust = array( 'address_name' => replace_accents($order->customer['firstname'] . ' ' . $order->customer['lastname']), 'address_street' => replace_accents($order->customer['street_address']), 'address_city' => replace_accents($order->customer['city']), 'address_state' => zen_get_zone_code($order->customer['country']['id'], $order->customer['zone_id'], $order->customer['zone_id']), 'address_zip' => $order->customer['postcode'], 'address_country' => $order->customer['country']['title'], 'address_country_code' => $order->customer['country']['iso_code_2'], 'payer_email' => $order->customer['email_address'], ); $optionsship = array( //'address_override' => module_payment_paypal_address_override, 'no_shipping' => module_payment_paypal_address_required, ); if (module_payment_paypal_detailed_cart == 'yes') $optionslineitems = ipn_getlineitemdetails(); if (sizeof($optionslineitems) > 0) { $optionslineitems['cmd'] = '_cart'; // $optionslineitems['num_cart_items'] = sizeof($order->products); if (isset($optionslineitems['shipping'])) { $optionslineitems['shipping_1'] = $optionslineitems['shipping']; unset($optionslineitems['shipping']); } if (isset($optionslineitems['handling'])) { $optionslineitems['handling_1'] = $optionslineitems['handling']; unset($optionslineitems['handling']); } unset($optionslineitems['subtotal']); // if line-item details couldn't be kept due to calculation mismatches or discounts etc, default to aggregate mode if (!isset($optionslineitems['item_name_1'])) $optionslineitems = array(); //if ($optionslineitems['amount'] != $this->transaction_amount) $optionslineitems = array(); ipn_debug_email('line item details (if blank, this means there was a data mismatch, and thus bypassed): ' . "\n" . print_r($optionslineitems, true)); } $products_name_display = ""; /* for ($i=0, $n=sizeof($order->products); $i<$n; $i++) { if(i > 0) { $products_name_display.= ', '; } $products_name_display.= $order->products[$i]['name']. '('. $order->products[$i]['qty'] .','.$order->products[$i]['dhisys_web_order_number'].')'; }*/ $optionsaggregate = array( 'cmd' => '_ext-enter', 'item_name' => $products_name_display, 'item_number' => $order_id, 'num_cart_items' => sizeof($order->products), 'amount' => number_format($this->transaction_amount, $currencies->get_decimal_places($my_currency)), 'shipping' => '0.00', ); if (module_payment_paypal_tax_override == 'true') $optionsaggregate['tax'] = '0.00'; if (module_payment_paypal_tax_override == 'true') $optionsaggregate['tax_cart'] = '0.00'; $optionstrans = array( 'upload' => (int)(sizeof($order->products) > 0), 'currency_code' => $my_currency, // 'paypal_order_id' => $paypal_order_id, //'no_note' => '1', //'invoice' => '', ); // if line-item info is invalid, use aggregate: if (sizeof($optionslineitems) > 0) $optionsaggregate = $optionslineitems; // prepare submission $options = array_merge($optionscore, $optionscust, $optionsphone, $optionsship, $optionstrans, $optionsaggregate); ipn_debug_email('keys for submission: ' . print_r($options, true)); if(sizeof($order->products) > 0){ $options['cmd'] = '_cart'; for ($i=0, $n=sizeof($order->products); $i<$n; $i++) { $options['item_name_'. (string)($i+1)] = $order->products[$i]['name']; $options['item_number_'. (string)($i+1)] = $order->products[$i]['dhisys_web_order_number']; $options['amount_'. (string)($i+1)] = number_format((float)$order->products[$i]['final_price'],2); $options['quantity_'. (string)($i+1)] = $order->products[$i]['qty']; } } // build the button fields foreach ($options as $name => $value) { // remove quotation marks $value = str_replace('"', '', $value); // check for invalid chars if (preg_match('/[^a-za-z_0-9]/', $name)) { ipn_debug_email('datacheck - aborting - preg_match found invalid submission key: ' . $name . ' (' . $value . ')'); break; } // do we need special handling for & and = symbols? //if (strpos($value, '&') !== false || strpos($value, '=') !== false) $value = urlencode($value); $buttonarray[] = zen_draw_hidden_field($name, $value); } $_session['paypal_transaction_info'] = array($this->transaction_amount, $this->transaction_currency); $process_button_string = implode("\n", $buttonarray) . "\n"; return $process_button_string; } } ?>
3. 在checkout_success页面中显示pay now按钮。打开文件"includes/modules/pages/checkout_success/header.php"，在文件的末尾添加下面的代码（如果你已经掌握zen-cart中的通知者/观察者模式，并且又不想破坏zen-cart核心代码的话，也可以创建一个观察类来监听notify_header_end_checkout_success来实现）。
require_once(dir_ws_classes . 'order.php'); require_once(dir_ws_classes . 'payment.php'); $payment_modules = new payment($orders->fields['payment_module_code']);
打开文件"includes/modules/templates/template_default/templates/tpl_checkout_success_default.php"，并在适当的位置加上如下的代码，这里对订单的状态进行了一个判断，当只有订单的状态在未付款状态，才显示该按钮，
<div id="pay_now"> <?php //&& $orders->fields['orders_status'] == '1' if(isset($payment_modules->paynow_action_url) && $payment_modules->paynow_action_url != ''&& $orders->fields['orders_status'] == '1'){ echo('<fieldset id="csnotifications">'); echo('<legend>'.text_paynow.'</legend>'); echo zen_draw_form('checkout_paynow', $payment_modules->paynow_action_url, 'post', 'id="checkout_confirmation" onsubmit="submitonce();"'); $selection = $payment_modules->selection(); echo('<div class="buttonrow payment_method">'.$selection[0]['module'].'</div>'); echo('<div class="buttonrow forward paynow">'); if (is_array($payment_modules->modules)) { echo $payment_modules->paynow_button($orders_id); } echo(zen_image_submit(button_image_paynow, button_image_paynow_alt, 'name="btn_paynow" id="btn_paynow"')); echo('</div>'); echo('</form>'); echo('</fieldset>'); } ?> </div>
4. 在历史订单中显示pay now按钮。需要显示pay now按钮的页面有三个：account, account_history,account_history_info，这里的实现和checkout_success页面的实现大同小异，只是传给$payment_modules的函数paynow_button的参数不一样而已，这里就不再赘述。
总结：
经过上面的修改，我们的流程如下：
1. 购物车(shopping cart)
2. [货运方式(delivery method)]
3. 支付方式(payment method)
4. 订单确认(confirmation)
5. 订单处理(checkout process)
6. 下单成功(checkout success)
7. [第三方网站支付]
因为从订单确认到订单处理，都是在我们自己的网站完成的，并且进入支付网站之前，订单已经存在了，这样就不会出现掉单的情况了。
更多php 修改zen-cart下单和付款流程以防止漏单。