Basic template for WooCommerce Payment Gateway Class

WooCommerce Payment Gateway

<?php

class WC_Gateway_EFAREM extends WC_Payment_Gateway
{
    public function __construct()
    {
        $this->id                 = 'efarem';
        $this->icon               = plugin_dir_url(__FILE__) . '/assets/images/efarem.png';
        $this->has_fields         = true;
        $this->method_title       = '{Title of Gateway}';
        $this->method_description = 'Description of gateway';

        $this->init_form_fields();
        $this->init_settings();

        $this->title              = $this->get_option('title');
        $this->vendor_name        = $this->get_option('vendor-name');

        add_action('woocommerce_update_options_payment_gateways_' . $this->id, array($this, 'process_admin_options'));
    }

    /**
     * Add form fields to the WooCommerce Gateway settings page
     *
     * @return void
     **/
    public function init_form_fields()
    {
        $this->form_fields = array(
            'enabled' => array(
                'title'       => __('Enable/Disable', 'woocommerce'),
                'type'        => 'checkbox',
                'label'       => __('Enable {Title of Gateway}', 'woocommerce'),
                'default'     => 'yes',
            ),
            'title' => array(
                'title'       => __('Title', 'woocommerce'),
                'type'        => 'text',
                'description' => __('This controls the title which the user sees during checkout.', 'woocommerce'),
                'default'     => __($this->method_title, 'woocommerce'),
                'desc_tip'    => true,
            ),
            'mode' => array(
                'title'       => __('Mode', 'woocommerce'),
                'type'        => 'select',
                'decription'  => __('Choose the payment mode', 'woocommerce'),
                'options'     => array('simulator' => __('Simulator', 'woocommerce'), 'test' => __('Test', 'woocommerce'), 'live' => __('Live', 'woocommerce')),
                'desc_tip'    => true,
            ),
        );
    }
}