OpenCart Community

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	public function callback() {
		$this->load->library('encryption');
	
		$encryption = new Encryption($this->config->get('config_encryption'));
		
		if (isset($this->request->post['custom'])) {
			$order_id = $encryption->decrypt($this->request->post['custom']);
		} else {
			$order_id = 0;
		}		
		
		$this->load->model('checkout/order');
				
		$order_info = $this->model_checkout_order->getOrder($order_id);
		
		if ($order_info) {
			$request = 'cmd=_notify-validate';
		
			foreach ($this->request->post as $key => $value) {
				$request .= '&' . $key . '=' . urlencode(html_entity_decode($value, ENT_QUOTES, 'UTF-8'));
			}
			
			if (!$this->config->get('pp_standard_test')) {
				$curl = curl_init('https://www.paypal.com/cgi-bin/webscr');
			} else {
				$curl = curl_init('https://www.sandbox.paypal.com/cgi-bin/webscr');
			}

			curl_setopt($curl, CURLOPT_POST, true);
			curl_setopt($curl, CURLOPT_POSTFIELDS, $request);
			curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
			curl_setopt($curl, CURLOPT_HEADER, false);
			curl_setopt($curl, CURLOPT_TIMEOUT, 30);
			curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
					
			$response = curl_exec($curl);
			
			if (!$response) {
				$this->log->write('PP_STANDARD :: CURL failed ' . curl_error($curl) . '(' . curl_errno($curl) . ')');
			}
					
			if ($this->config->get('pp_standard_debug')) {
				$this->log->write('PP_STANDARD :: IPN REQUEST: ' . $request);
				$this->log->write('PP_STANDARD :: IPN RESPONSE: ' . $response);
			}
						
			if ((strcmp($response, 'VERIFIED') == 0 || strcmp($response, 'UNVERIFIED') == 0) && isset($this->request->post['payment_status'])) {
				$order_status_id = $this->config->get('config_order_status_id');
				
				switch($this->request->post['payment_status']) {
					case 'Canceled_Reversal':
						$order_status_id = $this->config->get('pp_standard_canceled_reversal_status_id');
						break;
					case 'Completed':
						if ((float)$this->request->post['mc_gross'] == $this->currency->format($order_info['total'], $order_info['currency_code'], $order_info['currency_value'], false)) {
							$order_status_id = $this->config->get('pp_standard_completed_status_id');
						}
						break;
					case 'Denied':
						$order_status_id = $this->config->get('pp_standard_denied_status_id');
						break;
					case 'Expired':
						$order_status_id = $this->config->get('pp_standard_expired_status_id');
						break;
					case 'Failed':
						$order_status_id = $this->config->get('pp_standard_failed_status_id');
						break;
					case 'Pending':
						$order_status_id = $this->config->get('pp_standard_pending_status_id');
						break;
					case 'Processed':
						$order_status_id = $this->config->get('pp_standard_processed_status_id');
						break;
					case 'Refunded':
						$order_status_id = $this->config->get('pp_standard_refunded_status_id');
						break;
					case 'Reversed':
						$order_status_id = $this->config->get('pp_standard_reversed_status_id');
						break;	 
					case 'Voided':
						$order_status_id = $this->config->get('pp_standard_voided_status_id');
						break;								
				}
				
				if (!$order_info['order_status_id']) {
					$this->model_checkout_order->confirm($order_id, $order_status_id);
				} else {
					$this->model_checkout_order->update($order_id, $order_status_id);
				}
			} else {
				$this->model_checkout_order->confirm($order_id, $this->config->get('config_order_status_id'));
			}
			
			curl_close($curl);
		}	
	}

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http://www.YOURSITE.COM/index.php?route=payment/pp_standard/callback

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$response = curl_exec($curl);

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mail('YOU@YOURS.COM','pp response', $request);