Init

payment/Paypal/Paypal.php

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+<?php
+
+/**
+ * Simpla CMS
+ *
+ * @copyright 	2011 Denis Pikusov
+ * @link 		http://simplacms.ru
+ * @author 		Denis Pikusov
+ *
+ * Paypal checkout button
+ *
+ */
+ 
+require_once('api/Simpla.php');
+
+class Paypal extends Simpla
+{	
+	public function checkout_form($order_id, $button_text = null)
+	{
+		
+		if(empty($button_text))
+			$button_text = 'Checkout with Paypal';
+		
+		$order = $this->orders->get_order((int)$order_id);
+		$purchases = $this->orders->get_purchases(array('order_id'=>intval($order->id)));
+
+		$payment_method = $this->payment->get_payment_method($order->payment_method_id);
+		$currency = $this->money->get_currency(intval($payment_method->currency_id));
+		$payment_settings = $this->payment->get_payment_settings($payment_method->id);
+			
+		if($payment_settings['mode'] == 'sandbox') $paypal_url = "https://www.sandbox.paypal.com/cgi-bin/webscr";
+		else $paypal_url = "https://www.paypal.com/cgi-bin/webscr";
+			
+		$ipn_url = $this->config->root_url.'/payment/Paypal/callback.php';
+		$success_url = $this->config->root_url.'/order/'.$order->url;
+		$fail_url = $this->config->root_url.'/order/'.$order->url;
+
+		$button =	"<form method='post' action= '".$paypal_url."'>
+					<input type='hidden' name='charset' value='utf-8'>
+					<input type='hidden' name='currency_code' value='".$currency->code."'>
+					<input type='hidden' name='invoice' value='".$order->id."'>
+					<input type='hidden' name='business' value='".$payment_settings['business']."'>
+					<input type='hidden' name='cmd' value='_cart'>
+					<input type='hidden' name='upload' value='1'>
+					<input type='hidden' name='rm' value='2'>
+					<input type='hidden' name='notify_url' value='$ipn_url'>
+					<input type='hidden' name='return' value='$success_url'>
+					<input type='hidden' name='cancel_return' value='$fail_url'>
+					";
+					
+		if($order->discount>0)
+			$button .= "<input type='hidden' name='discount_rate_cart' value='".$order->discount."'>";
+					
+		if($order->coupon_discount>0)
+		{
+			$coupon_discount = $this->money->convert($order->coupon_discount, $payment_method->currency_id, false);
+			$button .= "<input type='hidden' name='discount_amount_cart' value='".$coupon_discount."'>";
+		}
+					
+		$i = 1;
+		foreach($purchases as $purchase)
+		{			
+			$price = $this->money->convert($purchase->price, $payment_method->currency_id, false);
+			$price = number_format($price, 2, '.', '');
+			$button .=	"<input type='hidden' name='item_name_".$i."' value='".$purchase->product_name.' '.$purchase->variant_name."'>
+						<input type='hidden' name='amount_".$i."' value='".$price."'>
+						<input type='hidden' name='quantity_".$i."' value='".$purchase->amount."'>";
+			$i++;
+		}
+			
+		$delivery_price = 0;
+		if($order->delivery_id && !$order->separate_delivery && $order->delivery_price>0)
+		{
+			$delivery_price = $this->money->convert($order->delivery_price, $payment_method->currency_id, false);
+			$delivery_price = number_format($delivery_price, 2, '.', '');
+			$button .=	"<input type='hidden' name='shipping_1' value='".$delivery_price."'>";
+		}
+
+		$button .=	"<input type='image' src='https://www.paypalobjects.com/en_US/i/btn/btn_xpressCheckout.gif' value='".$button_text."'>
+					</form>";
+		return $button;
+	}
+
+}

payment/Paypal/callback.php

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+<?php
+
+/**
+ * Simpla CMS
+ *
+ * @copyright 	2011 Denis Pikusov
+ * @link 		http://simplacms.ru
+ * @author 		Denis Pikusov
+ *
+ * IPN Script for Paypal
+ *
+ */
+
+// Working in root dir
+chdir ('../../');
+
+// Including simpla API
+require_once('api/Simpla.php');
+$simpla = new Simpla();
+
+
+// Get the order
+$order = $simpla->orders->get_order(intval($simpla->request->post('invoice')));
+if(empty($order))
+	die('Order not found');
+ 
+// Get payment method from this order
+$method = $simpla->payment->get_payment_method(intval($order->payment_method_id));
+if(empty($method))
+	die("Unknown payment method");
+
+// Payment method settings
+$settings = unserialize($method->settings);
+if($settings['mode'] == 'sandbox') $paypal_url = "https://www.sandbox.paypal.com/cgi-bin/webscr";
+else $paypal_url = "https://www.paypal.com/cgi-bin/webscr";
+
+
+// Verify transaction
+$postdata = ""; 
+foreach ($_POST as $key=>$value) $postdata.=$key."=".urlencode($value)."&"; 
+$postdata .= "cmd=_notify-validate";  
+$curl = curl_init($paypal_url); 
+curl_setopt ($curl, CURLOPT_HEADER, 0);  
+curl_setopt ($curl, CURLOPT_POST, 1); 
+curl_setopt ($curl, CURLOPT_POSTFIELDS, $postdata); 
+curl_setopt ($curl, CURLOPT_SSL_VERIFYPEER, 0);  
+curl_setopt ($curl, CURLOPT_RETURNTRANSFER, 1); 
+curl_setopt ($curl, CURLOPT_SSL_VERIFYHOST, 1); 
+$response = curl_exec($curl); 
+curl_close ($curl); 
+if ($response != "VERIFIED")
+	die("Could not verify transaction");
+	
+// Check payment status
+if($_POST["payment_status"] != "Completed" )
+	die('Incorrect status '.$_POST["payment_status"].$_POST["pending_reason"]);
+
+// Verify merchant email
+if ($simpla->request->post('receiver_email') != $settings['business']) 
+	die("Incorrect merchant email"); 
+
+// Verify transaction type
+if ($simpla->request->post('txn_type') != 'cart') 
+	die("Incorrect txn_type"); 
+
+// Is order already paid
+if($order->paid)
+	die('Duplicate payment');
+
+
+////////////////////////////////////
+// Verify total payment amount
+////////////////////////////////////
+$total_price = 0;
+
+// Get order purchases
+$purchases = $simpla->orders->get_purchases(array('order_id'=>intval($order->id)));
+foreach($purchases as $purchase)
+{			
+	$price = $simpla->money->convert($purchase->price, $method->currency_id, false);
+	$price = round($price, 2);
+	$total_price += $price*$purchase->amount;
+}
+// Substract the discount
+if($order->discount)
+{
+	$total_price *= (100-$order->discount)/100;
+	$total_price = round($total_price, 2);
+}
+// Adding delivery price
+if($order->delivery_id && !$order->separate_delivery && $order->delivery_price>0)
+{
+	$delivery_price = $simpla->money->convert($order->delivery_price, $payment_method->currency_id, false);
+	$delivery_price =round($delivery_price, 2);
+	$total_price += $delivery_price;
+}
+if($total_price != $simpla->request->post('mc_gross'))
+	die("Incorrect total price (".$total_price."!=".$simpla->request->post('mc_gross').")");
+       
+// Set order status paid
+$simpla->orders->update_order(intval($order->id), array('paid'=>1));
+
+// Write off products
+$simpla->orders->close(intval($order->id));
+$simpla->notify->email_order_user(intval($order->id));
+$simpla->notify->email_order_admin(intval($order->id));
+
+
+function logg($str)
+{
+	file_put_contents('payment/Paypal/log.txt', file_get_contents('payment/Paypal/log.txt')."\r\n".date("m.d.Y H:i:s").' '.$str);
+}

payment/Paypal/settings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module>
+	<name>
+		Paypal
+	</name>
+	<settings>
+		<variable>business</variable>
+		<name>Merchant email</name>
+	</settings>
+	<settings>
+		<variable>mode</variable>
+		<name>Mode</name>
+		<options>
+			<name>Real payments</name>
+			<value>real</value>
+		</options>
+		<options>
+			<name>Sandbox mode</name>
+			<value>sandbox</value>
+		</options>
+	</settings>
+</module>