wcpos-email-invoice.php

<?php
/**
 * Plugin Name: WooCommerce POS Invoice Payment Gateway
 * Plugin URI: https://github.com/kilbot/wcpos-email-invoice
 * Description: Send an email to the customer with a link to pay for the order.
 * Version: 0.0.4
 * Author: kilbot
 * License: GNU General Public License v3.0
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
 * Text Domain: wcpos-email-invoice
 */

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

function woocommerce_custom_gateway_init() {
    if (!class_exists('WC_Payment_Gateway')) return;

    /**
     * Localisation
     */
    load_plugin_textdomain('wcpos-email-invoice', false, dirname(plugin_basename(__FILE__)) . '/languages');
    
    /**
     * Gateway class
     */
    class WCPOS_Email_Invoice extends WC_Payment_Gateway {

        public function __construct() {
            $this->id = 'pos_email_invoice';
            $this->icon = ''; // URL of the icon that will be displayed on checkout page near your gateway name
            $this->has_fields = false;
            $this->method_title = 'Custom Gateway';
            $this->method_description = 'Description of your custom gateway';

            // Load the settings.
            $this->init_form_fields();
            $this->init_settings();

            // Define user set variables
            $this->title = $this->get_option('title');
            $this->description = $this->get_option('description');
            $this->instructions = $this->get_option('instructions', $this->description);

            // only allow in the POS
            $this->enabled = false;

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

        public function init_form_fields() {
            $this->form_fields = array(
                'title' => array(
                    'title' => __('Title', 'wcpos-email-invoice'),
                    'type' => 'text',
                    'description' => __('This controls the title which the user sees during checkout.', 'wcpos-email-invoice'),
                    'default' => __('Send Invoice Email', 'wcpos-email-invoice'),
                    'desc_tip' => true,
                ),
                'description' => array(
                    'title' => __('Description', 'wcpos-email-invoice'),
                    'type' => 'textarea',
                    'description' => __('This controls the description which the user sees during checkout.', 'wcpos-email-invoice'),
                    'default' => __('An email will be sent to the customer email with \'Pay for this order\' link.', 'wcpos-email-invoice')
                )
            );
        }

        public function process_payment($order_id) {
          $order = wc_get_order($order_id);
      
          // Mark as pending (we're awaiting the payment)
          $order->update_status('pending', __('Awaiting custom payment. ', 'wc-custom-gateway'));
      
          // Reduce stock levels
          wc_reduce_stock_levels($order_id);
      
          // Trigger the 'email customer invoice' action
          $mailer = WC()->mailer();
          $email_to_send = 'WC_Email_Customer_Invoice';
          $emails = $mailer->get_emails();
      
          // Ensure the email class exists and send the email
          if (!empty($emails) && isset($emails[$email_to_send])) {
            $emails[$email_to_send]->trigger($order->get_id(), $order);
            $order->add_order_note(__('Customer invoice email sent via POS. ', 'wc-custom-gateway'));
          } else {
            $order->add_order_note(__('Failed to send customer invoice email. ', 'wc-custom-gateway'));
          }
      
          // Return thankyou redirect
          return array(
              'result' => 'success',
              'redirect' => $this->get_return_url($order)
          );
      }
      
    }

    /**
     * Add the Gateway to WooCommerce
     **/
    function woocommerce_add_custom_gateway($methods) {
        $methods[] = 'WCPOS_Email_Invoice';
        return $methods;
    }

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