admin/controller/extension/payment/pp_express.php

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<?php
class ControllerExtensionPaymentPPExpress extends Controller {
	private $error = array();
	private $opencart_connect_url = 'https://www.opencart.com/index.php?route=external/paypal_auth/connect';
	private $opencart_retrieve_url = 'https://www.opencart.com/index.php?route=external/paypal_auth/retrieve';

	public function index() {
		$this->load->language('extension/payment/pp_express');

		$this->document->setTitle($this->language->get('heading_title'));

		$this->load->model('setting/setting');

		if (($this->request->server['REQUEST_METHOD'] == 'POST') && $this->validate()) {
			$this->model_setting_setting->editSetting('payment_pp_express', $this->request->post);

			$this->session->data['success'] = $this->language->get('text_success');

			$this->response->redirect($this->url->link('marketplace/extension', 'user_token=' . $this->session->data['user_token'] . '&type=payment'));
		}

		$data['user_token'] = $this->session->data['user_token'];

		$data['button_configure'] = $this->url->link('extension/module/pp_button/configure', 'user_token=' . $this->session->data['user_token']);

		if (isset($this->error['warning'])) {
			$data['error_warning'] = $this->error['warning'];
		} else {
			$data['error_warning'] = '';
		}

		if (isset($this->error['username'])) {
			$data['error_username'] = $this->error['username'];
		} else {
			$data['error_username'] = '';
		}

		if (isset($this->error['password'])) {
			$data['error_password'] = $this->error['password'];
		} else {
			$data['error_password'] = '';
		}

		if (isset($this->error['signature'])) {
			$data['error_signature'] = $this->error['signature'];
		} else {
			$data['error_signature'] = '';
		}

		if (isset($this->error['sandbox_username'])) {
			$data['error_sandbox_username'] = $this->error['sandbox_username'];
		} else {
			$data['error_sandbox_username'] = '';
		}

		if (isset($this->error['sandbox_password'])) {
			$data['error_sandbox_password'] = $this->error['sandbox_password'];
		} else {
			$data['error_sandbox_password'] = '';
		}