monerowp/monero/monero_gateway.php

<?php
/*
Plugin Name: Monero - WooCommerce Gateway
Plugin URI: http://monerointegrations.com
Description: Extends WooCommerce by Adding the Monero Gateway
Version: 1.0
Author: SerHack
Author URI: http://monerointegrations.com
*/
if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}
// Include our Gateway Class and register Payment Gateway with WooCommerce
add_action( 'plugins_loaded', 'monero_init', 0 );
function monero_init() {
	/* If the class doesn't exist (== WooCommerce isn't installed), return NULL */
	if ( ! class_exists( 'WC_Payment_Gateway' ) ) return;
	
	/* If we made it this far, then include our Gateway Class */
	include_once( 'gateway.php' );

	// Lets add it too WooCommerce
    add_filter( 'woocommerce_payment_gateways', 'monero_gateway' );
	function monero_gateway( $methods ) {
		$methods[] = 'Monero_Gateway';
		return $methods;
	}
}

/*
 * Add custom link
 * The url will be http://yourworpress/wp-admin/admin.php?=wc-settings&tab=checkout
 */
add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), 'monero_payment' );
function monero_payment( $links ) {
	$plugin_links = array(
		'<a href="' . admin_url( 'admin.php?page=wc-settings&tab=checkout' ) . '">' . __( 'Settings', 'monero_payment' ) . '</a>',
	);

	return array_merge( $plugin_links, $links );	
}