Init

payment/Interkassa/Interkassa.php

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+<?php
+
+require_once('api/Simpla.php');
+
+class Interkassa extends Simpla
+{	
+	public function checkout_form($order_id, $button_text = null)
+	{
+		if(empty($button_text))
+			$button_text = 'Перейти к оплате';
+		
+		$order = $this->orders->get_order((int)$order_id);
+		$payment_method = $this->payment->get_payment_method($order->payment_method_id);
+		$payment_currency = $this->money->get_currency(intval($payment_method->currency_id));
+		$settings = $this->payment->get_payment_settings($payment_method->id);
+		
+		$price = round($this->money->convert($order->total_price, $payment_method->currency_id, false), 2);
+		
+		
+		// описание заказа
+		$desc = 'Оплата заказа №'.$order->id;
+		
+		$shop_id = $settings['interkassa_shop_id'];
+					
+		$button = "<form name='payment' action='https://interkassa.com/lib/payment.php' method='post' 
+					enctype='application/x-www-form-urlencoded' accept-charset='UTF-8'>
+					<input type='hidden' name='ik_shop_id' value='$shop_id'>
+					<input type='hidden' name='ik_payment_amount' value='$price'>
+					<input type='hidden' name='ik_payment_id' value='$order->id'>
+					<input type='hidden' name='ik_payment_desc' value='$desc'>
+					<input type='submit' name='process' value='$button_text' class='checkout_button'>
+					</form>";
+		return $button;
+	}
+}

payment/Interkassa/callback.php

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+<?php
+
+/**
+ * Simpla CMS
+ *
+ * @copyright 	2012 Denis Pikusov
+ * @link 		http://simplacms.ru
+ * @author 		Denis Pikusov
+ *
+ * К этому скрипту обращается Interkassa в процессе оплаты
+ *
+ */
+
+// Работаем в корневой директории
+chdir ('../../');
+require_once('api/Simpla.php');
+$simpla = new Simpla();
+
+////////////////////////////////////////////////
+// Проверка статуса
+////////////////////////////////////////////////
+if($_POST['ik_payment_state'] !== 'success')
+	die('bad status');
+
+////////////////////////////////////////////////
+// Выберем заказ из базы
+////////////////////////////////////////////////
+$order = $simpla->orders->get_order(intval($_POST['ik_payment_id']));
+if(empty($order))
+	die('Оплачиваемый заказ не найден');
+ 
+////////////////////////////////////////////////
+// Выбираем из базы соответствующий метод оплаты
+////////////////////////////////////////////////
+$method = $simpla->payment->get_payment_method(intval($order->payment_method_id));
+if(empty($method))
+	die("Неизвестный метод оплаты");
+	
+$settings = unserialize($method->settings);
+$payment_currency = $simpla->money->get_currency(intval($method->currency_id));
+
+////////////////////////////////////////////////
+// Проверка id магазина
+////////////////////////////////////////////////
+if($settings['interkassa_shop_id'] !== $_POST['ik_shop_id'])
+	die('bad shop id');
+
+// Проверяем контрольную подпись
+$ik_shop_id = $_POST['ik_shop_id'];
+$ik_payment_amount = $_POST['ik_payment_amount'];
+$ik_payment_id = $_POST['ik_payment_id'];
+$ik_payment_desc = $_POST['ik_payment_desc'];
+$ik_paysystem_alias = $_POST['ik_paysystem_alias'];
+$ik_baggage_fields = $_POST['ik_baggage_fields'];
+$ik_payment_state = $_POST['ik_payment_state'];
+$ik_trans_id = $_POST['ik_trans_id'];
+$ik_currency_exch = $_POST['ik_currency_exch'];
+$ik_fees_payer = $_POST['ik_fees_payer'];
+$ik_sign_hash = $_POST['ik_sign_hash'];;
+
+$secret_key = $settings['interkassa_secret_key'];
+$ik_sign_hash_str = $ik_shop_id.':'.$ik_payment_amount.':'.$ik_payment_id.':'.$ik_paysystem_alias.':'.$ik_baggage_fields.':'.$ik_payment_state.':'.$ik_trans_id.':'.$ik_currency_exch.':'.$ik_fees_payer.':'.$secret_key;
+
+if(strtoupper($ik_sign_hash) !== strtoupper(md5($ik_sign_hash_str)))
+	die('bad sign');
+
+// Нельзя оплатить уже оплаченный заказ  
+if($order->paid)
+	die('Этот заказ уже оплачен');
+
+if($_POST['ik_payment_amount'] != round($simpla->money->convert($order->total_price, $method->currency_id, false), 2) || $_POST['ik_payment_amount']<=0)
+	die("incorrect price");
+
+// Установим статус оплачен
+$simpla->orders->update_order(intval($order->id), array('paid'=>1));
+
+// Отправим уведомление на email
+$simpla->notify->email_order_user(intval($order->id));
+$simpla->notify->email_order_admin(intval($order->id));
+
+// Спишем товары  
+$simpla->orders->close(intval($order->id));
+
+exit();

payment/Interkassa/settings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module>
+	<name>
+		Интеркасса
+	</name>
+	<settings>
+		<variable>interkassa_shop_id</variable>
+		<name>Идентификатор магазина</name>
+	</settings>
+	<settings>
+		<variable>interkassa_secret_key</variable>
+		<name>Секретный ключ</name>
+	</settings>
+</module>