fis-gateway - http://rayflores.com/wp-content/uploads/2014/SFArtsGalleries_PayDirect-Web-Config_v0.3_08292014.docx

end_resulting_gateway.php

<?php 
/* 
Plugin Name: WooCommerce FIS Gateway
Plugin URI: http://rayflores.com/plugins/fis-gateway
Description: Extends WooCommerce with a <a href="https://paydirect.ca.link2gov.com/SFACArtsSales" target="_blank">FIS</a> gateway. A FIS gateway account, and a server with SSL support and an SSL certificate is required for security reasons.
Author: Ray Flores
Author URI: http://rayflores.com
Version: 1.0.0
Text Domain: wc-gateway-fis
Domain Path: /languages/

*/

/**
 * Required functions
 */
if ( ! function_exists( 'woothemes_queue_update' ) )
	require_once( 'woo-includes/woo-functions.php' );

add_action('plugins_loaded', 'woocommerce_gateway_fis_init', 0);

function woocommerce_gateway_fis_init() {

	if ( ! class_exists( 'WC_Payment_Gateway' ) ) return;

	/**
	 * Localisation
	 */
	load_plugin_textdomain( 'wc-gateway-fis', false, dirname( plugin_basename( __FILE__ ) ) . '/languages' );

	define('FIS_DIR', WP_PLUGIN_DIR . "/" . plugin_basename( dirname(__FILE__) ) . '/');
	

	/**
	 * FIS Gateway Class
	 **/
	class WC_Gateway_Fis extends WC_Payment_Gateway {

		var $notify_url;
		/**
		* Constructor for the gateway.
		*
		* @access public
		* @return void
		*/
		public function __construct() {
			$this->id 								= 'fis';
			$this->icon 							= apply_filters( 'woocommerce_fis_icon', WC()->plugin_url() . '/imgs/fis.png' );
			$this->has_fields 					= false;
			$this->order_button_text		= __( 'Proceed to PayDirect', 'woocommerce' );
			$this->liveurl 							= 'https://paydirect.ca.link2gov.com/SFACArtsSales';
			$this->method_title 				= __( 'FIS', 'woocommerce' );
			$this->method_description 	= __( 'FIS PayDirect works by sending the user to PayDirect to enter their payment information.', 'woocommerce' );
			$this->notify_url 					= WC()->api_request_url( 'WC_Gateway_Fis' );
			$this->supports 					= array( 'products' );
			$this->has_fields  			= false;
		// Load the settings.
			$this->init_form_fields();
			$this->init_settings();

			// Get setting values
			$this->enabled    		= $this->settings['enabled'];
			$this->merchantcode  		= $this->settings['MerchantCode'];
			$this->settlecode 		 = $this->settings['SettleCode'];
			$this->debugon   		= $this->settings['debugon'];
			$this->debugrecipient  	= $this->settings['debugrecipient'];


			// Actions
			add_action( 'valid-fis-standard-request', array( $this, 'successful_request' ) );
			add_action( 'woocommerce_receipt_fis', array( $this, 'receipt_page' ) );
		//	add_action( 'woocommerce_thankyou_fis', array( $this, 'pdt_return_handler' ) );	// not expecting a responce?  no return being used at this time
			add_action('woocommerce_update_options_payment_gateways', array( $this, 'process_admin_options'));
			add_action('woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options'));
	
		}

		/**
		 * Initialize Gateway Settings Form Fields
		 */
		function init_form_fields() {

			$this->form_fields = array(
				'enabled' => array(
					'title' => __( 'Enable/Disable', 'wc-gateway-fis' ),
					'label' => __( 'Enable FIS Gateway', 'wc-gateway-fis' ),
					'type' => 'checkbox',
					'description' => '',
					'default' => 'no'
				),
				'title' => array(
					'title' => __( 'Title', 'wc-gateway-fis' ),
					'type' => 'text',
					'description' => __( 'This controls the title which the user sees during checkout.', 'wc-gateway-fis' ),
					'default' => __( 'Credit card', 'wc-gateway-fis' )
				),
				'description' => array(
					'title' => __( 'Description', 'wc-gateway-fis' ),
					'type' => 'textarea',
					'description' => __( 'This controls the description which is displayed to the customer.', 'wc-gateway-fis' ),
					'default' => 'Pay with your MasterCard, Visa, Discover or American Express'
				),
				'MerchantCode' => array(
					'title' => __( 'Merchant Code', 'wc-gateway-fis' ),
					'type' => 'text',
					'description' => __( 'Merchant Code given to you by FIS', 'wc-gateway-fis' ),
					'default' => ''
				),
				'SettleCode' => array(
					'title' => __( 'Settle Code', 'wc-gateway-fis' ),
					'type' => 'text',
					'description' => __( 'Settle Code given to you by FIS', 'wc-gateway-fis' ),
					'default' => ''
				),
				'debugon' => array(
					'title' => __( 'Debugging', 'wc-gateway-fis' ),
					'label' => __( 'Enable debug emails', 'wc-gateway-fis' ),
					'type' => 'checkbox',
					'description' => __( 'Receive emails containing the data sent to and from FIS.', 'wc-gateway-fis' ),
					'default' => 'no'
				),
				'debugrecipient' => array(
					'title' => __( 'Debugging Email', 'wc-gateway-fis' ),
					'type' => 'text',
					'description' => __( 'Who should receive the debugging emails.', 'wc-gateway-fis' ),
					'default' =>  get_option('admin_email')
				),
			);
		}


		/**
		 * Admin Panel Options
		 * - Options for bits like 'title' and availability on a country-by-country basis
		 */
		public function admin_options() {
?>
			<p><a href="http://www.fisglobal.com/products-government-governmentpayments-webpayments/" target="_blank"><img src="<?php echo $this->logo;?>" /></a></p>
			<h3><?php _e('FIS', 'wc-gateway-fis'); ?></h3>
	    	<p><?php _e( 'FIS allows customers to checkout using a credit card by adding credit card fields on the checkout page and then sending the details to FIS for verification.', 'wc-gateway-fis' ); ?></p>
	    	<table class="form-table">
	    		<?php $this->generate_settings_html(); ?>
			</table><!--/.form-table-->
	    	<?php
		}

			/**
			* Limit the length of item names
			* @param string $item_name
			* @return string
			*/
			public function fis_item_name( $item_name ) {
				if ( strlen( $item_name ) > 127 ) {
					$item_name = substr( $item_name, 0, 124 ) . '...';
				}
					return html_entity_decode( $item_name, ENT_NOQUOTES, 'UTF-8' );
			}		
		
			/**
			* Get FIS Args for passing to FIS
			*
			* @access public
			* @param mixed $order
			* @return array
			*/
			function get_fis_args( $order ) {
				$order_id = $order->id;
						if ( 'yes' == $this->debugon ) {
						$this->log = new WC_Logger();
						$this->log->add( 'FIS', 'Generating payment form for order ' . $order->get_order_number() . '. Notify URL: ' . $this->notify_url );
						}
				
				// FIS Args
				$fis_args = array(
						'MerchantCode' => $this->merchantcode,
						'SettleCode' => $this->settlecode,
						'PaymentMethod' => 'CreditOrDebit',
						'ReturnUrl' => $this->get_return_url( $order ), // build woo api link ? 
						'CancelUrl' => $order->get_cancel_order_url(), // cancel link? 
					//	'LineItems' => $this->get_line_items($order), //'[1*Item 1*Description 1*125.00],[2*Tax**15.50],[3*Shipping**30.00]'
						// Billing Address info
						'BillingCity' => $order->billing_city,
						'BillingState' => $order->billing_state,
						'BillingPostalCode' => $order->billing_postcode,
						'BillingCountry' => $order->billing_country,
						'BillingEmail' => $order->billing_email,
						'BillingProvince' => ' ',
						'BillingPhone' => $order->billing_phone
					);
				// Try to send line items, or default to sending the order as a whole
		if ( $line_items = $this->get_line_items( $order ) ) {
			//$fis_args = array_merge( $fis_args, $line_items );
		} 

		$fis_args = apply_filters( 'woocommerce_fis_args', $fis_args );

		return $fis_args;
	}

		private function get_line_items( $order ) {

		$item_loop        = 0;
		$args             = array();
		$lineItems_1 = '';
		// Products
		if ( sizeof( $order->get_items() ) > 0 ) {
			foreach ( $order->get_items() as $item ) {
				if ( ! $item['qty'] ) {
					continue;
				}
				
				$item_loop ++;
				$product   = $order->get_product_from_item( $item );
				$item_name = $item['name'];
				$item_meta = new WC_Order_Item_Meta( $item['item_meta'] );

				if ( $meta = $item_meta->display( true, true ) ) {
					$item_name .= ' ( ' . $meta . ' )';
				}
				#1 [N*ItemName*SKU*Price]->LOOP ITEMS >0 : [N+1*ItemName*Sku*Price],[N+1*ItemName*Sku*Price]<<END ITEMS : [lastN+1*Tax**TotalTax],[taxN+1*Shipping**TotalShipping]
				$lineItems_1 .= '[' . $item_loop . '*' . $this->fis_item_name( $item_name ) . '*' .$product->get_sku() . '*' . $item['line_subtotal']  . '],';

				}
				#2
				$tax_loop = sizeof( $order->get_items() ) + 1;
				$tax_items_1 = '[' . $tax_loop . '*Tax**' . $order->get_total_tax() . ']';
				
				#3
				$ship_loop = $tax_loop + 1;
				$ship_items_1 = '[' . $ship_loop . '*Shipping**' . number_format( $order->get_total_shipping(), 2, '.', '' ) . ']';
				
				
				$args['LineItems'] = $lineItems_1 . $tax_items_1 . ',' . $ship_items_1; // Array([LineItems] => [1*NAME*Price],[2*Tax**TotalTax],[3*Shipping**TotalShipping])  // woohoo!
				$line_items_echo = $lineItems_1 . $tax_items_1 . ',' . $ship_items_1; // [1*NAME*Price],[2*Tax**TotalTax],[3*Shipping**TotalShipping] // just values
		}


		//return $args;
		return $line_items_echo;
	}

				
	
	/**
	 * Output for the order received page.
	 *
	 * @access public
	 * @return void
	 */
	public function receipt_page( $order ) {
		echo '<p>' . __( 'Thank you - your order is now pending payment. You should be automatically redirected to FIS to make payment.', 'woocommerce' ) . '</p>';

		echo $this->generate_fis_form( $order );
	}

			/**
			* Generate the FIS button link
			*
			* @access public
			* @param mixed $order_id
			* @return string
			*/
			function generate_fis_form( $order_id ) {
				$order = wc_get_order( $order_id );
				$fis_adr = $this->liveurl . '?';
				$fis_args = $this->get_fis_args( $order );
				//$this->get_line_items( $order );

			/*	$fis_args_array = array();
					foreach ( $fis_args as $key => $value ) {
					$fis_args_array[] = '<input type="hidden" name="'.esc_attr( $key ) . '" value="' . esc_attr( $value ) . '" />';
					}
				*/	$output = '';
					$output .= '<form action="' . esc_url( $fis_adr ) . '" method="post" id="fis_payment_form" target="_top">';
					$output .=	'<input type="hidden" name="MerchantCode" value="' .  $this->merchantcode . '" />';
					$output .=	'<input type="hidden" name="SettleCode" value="' . $this->settlecode . '" />';
					$output .=	'<input type="hidden" name="PaymentMethod" value="CreditOrDebit" />';
					$output .=	'<input type="hidden" name="ReturnUrl" value="' . $this->get_return_url( $order )  . '" />'; // build woo api link ? 
					$output .=	'<input type="hidden" name="CancelUrl" value="' . $order->get_cancel_order_url() . '" />'; // cancel link? 
					$output .=	'<input type="hidden" name="LineItems" value="' . $this->get_line_items( $order ) . '" />';//[1*Item 1*Description 1*125.00],[2*Tax**15.50],[3*Shipping**30.00]" />';
					$output .=	'<input type="hidden" name="BillingCountry" value="' . $order->billing_country . '" />';
					$output .=	'<input type="hidden" name="BillingCity" value="' . $order->billing_city . '" />';
					$output .=	'<input type="hidden" name="BillingProvince" value="For International Addresses" />';
					$output .=	'<input type="hidden" name="BillingState" value="' . $order->billing_state . '" />';
					$output .=	'<input type="hidden" name="BillingPostalCode" value="' . $order->billing_postcode . '" />';
					$output .=	'<input type="hidden" name="BillingPhone" value="' . $order->billing_phone . '" />';  
					$output .=	'<input type="hidden" name="BillingEmail" value="' . $order->billing_email . '" />';

				
					wc_enqueue_js( '
					$.blockUI({
										message: "' . esc_js( __( 'Thank you for your order. We are now redirecting you to PayDirect to make payment.', 'woocommerce' ) ) . '",
										baseZ: 99999,
										overlayCSS:
										{
										background: "#fff",
										opacity: 0.6
										},
										css: {
										padding: "20px",
										zindex: "9999999",
										textAlign: "center",
										color: "#555",
										border: "3px solid #aaa",
										backgroundColor:"#fff",
										cursor: "wait",
										lineHeight: "24px",
										}
									});
										jQuery("#submit_fis_payment_form").click();
								' );
				/*'<form action="' . esc_url( $fis_adr ) . '" method="post" id="fis_payment_form" target="_top"> 
				'. implode( '', $fis_args_array ) . ' $output . '	 */
				return $output . '
				<!-- Button Fallback -->
				<div class="payment_buttons">
				<input type="submit" class="button alt" id="submit_fis_payment_form" value="' . __( 'Pay via PayDirect', 'woocommerce' ) . '" /> <a class="button cancel" href="' . esc_url( $order->get_cancel_order_url() ) . '">' . __( 'Cancel order &amp; restore cart', 'woocommerce' ) . '</a>
				</div>
				<script type="text/javascript">
				jQuery(".payment_buttons").hide();
				</script>
				</form>';  
			}


			/**
			* Process the payment and return the result
			*
			* @access public
			* @param int $order_id
			* @return array
			*/
				/**
				* Process the payment and return the result
				*
				* @access public
				* @param int $order_id
				* @return array
				*/
			function process_payment( $order_id ) {
				$order = wc_get_order( $order_id );
				$fis_args = $this->get_fis_args( $order );
				$fis_args = http_build_query( $fis_args, '', '&' );
				$fis_adr = $this->liveurl . '?';

				return array(
				'result' => 'success',
				'redirect' => $order->get_checkout_payment_url( true )
				);
			}
		

		/**
		 * Get post data if set
		 **/
		function get_post($name) {
			if (isset($_POST[$name])) {
				return $_POST[$name];
			}
			return NULL;
		}

		/**
		 * Output a message or error
		 * @param  string $message
		 * @param  string $type
		 */
		function debug( $message, $type = 'notice' ) {
			if ( version_compare( WOOCOMMERCE_VERSION, '2.1', '>=' ) ) {
				wc_add_notice( $message, $type );
			} else {
				global $woocommerce;
				$woocommerce->add_message( $message );
			}
		}

		/**
		 * Send debugging email
		 **/
		function send_debugging_email( $debug ) {

			if ($this->debugon!='yes') return; // Debug must be enabled
			if (!$this->debugrecipient) return; // Recipient needed

			// Send the email
			wp_mail( $this->debugrecipient, __('FIS Debug', 'wc-gateway-fis'), $debug );

		}

	}

	/**
	 * Plugin page links
	 */
	function wc_fis_plugin_links( $links ) {
	
		$plugin_links = array(
			'<a href="' . admin_url( 'admin.php?page=wc-settings&tab=checkout&section=wc_gateway_fis' ) . '">' . __( 'Settings', 'wc-gateway-fis' ) . '</a>',
			'<a href="#">' . __( 'Support', 'wc-gateway-fis' ) . '</a>',
			'<a href="#">' . __( 'Docs', 'wc-gateway-fis' ) . '</a>',
		);
	
		return array_merge( $plugin_links, $links );
	}

	
	/**
	 * Add the gateway to woocommerce
	 **/
	function add_fis_gateway( $methods ) {
		$methods[] = 'WC_Gateway_Fis'; return $methods;
	}

	add_filter('woocommerce_payment_gateways', 'add_fis_gateway' );
}

A few things:

1. You can pull this since this isn't a Woo plugin and won't be getting any updates:
   https://gist.github.com/rayflores/3aba1e28a9d7380ddf90#file-fis-gateway-php-L23
2. May want to put this inside of the woocommerce_gateway_fis_init() function:
   https://gist.github.com/rayflores/3aba1e28a9d7380ddf90#file-fis-gateway-php-L25
3. Since this is a redirect gateway (sends the customer off site) you don't need an SSL check. You can pull out fis_ssl_check() and the associated action calling it.
4. This is probably unnecessary since there the umTransaction class is tied to the ChargeItPro gateway.
   https://gist.github.com/rayflores/3aba1e28a9d7380ddf90#file-fis-gateway-php-L286
5. You can delete this and just have the second unset(). This was for keeping compatibility with WooCommerce 1.x and 2.0.
   https://gist.github.com/rayflores/3aba1e28a9d7380ddf90#file-fis-gateway-php-L421