WooCommerce Email Triggering Twice

Hi folks,

Asked this in the main WordPress forums and was pointed over here as well.

I’m in the middle of developing a custom plugin for integrating my WooCommerce store with a third-party. As part of that integration I’m sending a new email, which (after some kind help on these forums!) is sending fine. The trouble is, the email in question is sending twice and I’m not sure why. I’m sure it’s something simple, but I can’t spot what it is.

Can any of you kind folks spot where I’m going wrong in my email class below? I *think* this is where the problem ought to be.

<?php

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

if ( ! class_exists( 'Foundry_Code_Email', false ) ) :

	class Foundry_Code_Email extends WC_Email {

		/**
		* Set email defaults
		*/

		public function __construct() {
		

			$this->id = 'foundry_code_email'; // Unique ID for custom email
			$this->customer_email = true; // Is a customer email
			$this->title = __( 'Foundry Premium Content Email', 'woocommerce' ); // Title field in WooCommerce Email settings
			$this->description = __( 'Foundry email is sent when customer purchases Foundry Premium Content', 'woocommerce' ); // Description field in WooCommerce email settings
			$this->template_base	= WP_PLUGIN_DIR . '/foundry-premium-content/templates/';
			$this->template_html = 'emails/foundry-code-email.php';
			$this->template_plain = 'emails/plain/foundry-code-email.php';
			// $this->template_html = 'emails/customer-refunded-order.php';
			$this->placeholders = array(
				'{site_title}'	=> $this->get_blogname(),
				'{order_date}'	=> '',
				'{order_number}' => '',
			);

			// Trigger email when woocommerce_order_status_completed_notification is called when payment is complete
			add_action( 'woocommerce_order_status_completed_notification', array( $this, 'trigger' ), 10, 2 );

			// Call parent constructor to load any other defaults not explicitly defined here.
			parent::__construct();
		}

		/**
		* Prepares email content and triggers the email
		*
		* @param int $order_id
		*/
		public function trigger( $order_id, $order = false ) {
			$this->setup_locale();	

			if ( $order_id && ! is_a( $order, 'WC_Order') ) {
				$order = wc_get_order( $order_id );
			}

			if ( is_a( $order, 'WC_Order' ) ) {
				$this->object							= $order;
				$this->recipient						= $this->object->get_billing_email();
				$this->placeholders['{order_date}']		= wc_format_datetime( $this->object->get_date_created() );
				$this->placeholders['{order_number}']	= $this->object->get_order_number();

				// Maybe include an additional check to make sure that stuff happened
			}

			if ( $this->is_enabled() && $this->get_recipient() ) {
				// All well, send the email
				$this->send ( $this->get_recipient(), $this->get_subject(), $this->get_content(), $this->get_headers(), $this->get_attachments() );
			}

			$this->restore_locale();

			// Add order note about the same
			$this->object->add_order_note( sprintf(__('%s email sent to the customer.', 'woocommerce'), $this->get_title() ) );

			// Set order meta to indicate that the welcome email was sent
			update_post_meta( $order_id, 'foundry_code_email_sent', 1);
		} 

		/**
		* Get email subject.
		*
		* @since 3.1.0
		* @return string
		*/
		public function get_default_subject() {
			return __( 'Foundry Premium Content Codes', 'woocommerce' );
		}

		/**
		* Get email heading
		*
		* @since 3.1.0
		* @return string
		*/
		public function get_default_heading() {
			return __('Your Foundry Premium Content Codes:', 'woocommerce' );
		}

		/**
		* get_content_html function
		*
		* @return string
		*/
		public function get_content_html() {
			return wc_get_template_html(
					$this->template_html,
					array(
						'order'              => $this->object,
						'email_heading'      => $this->get_heading(),
						'additional_content' => $this->get_additional_content(),
						'sent_to_admin'      => false,
						'plain_text'         => false,
						'email'              => $this,
					), '', $this->template_base
				);
		}

		public function get_content_plain() {
			return wc_get_template_html(
					$this->template_plain,
					array(
						'order'              => $this->object,
						'email_heading'      => $this->get_heading(),
						'additional_content' => $this->get_additional_content(),
						'sent_to_admin'      => false,
						'plain_text'         => true,
						'email'              => $this,
					), '', $this->template_base
				);
		} 

		public function get_default_additional_content() {
			return __( 'Thanks for shopping with us.', 'woocommerce' );
		}

		/*
		* Initialise settings form fields
		*/
		public function init_form_fields() {
			$this->form_fields = array(
				'enabled'	=> array(
						'title'		=> __( 'Enable/Disable', 'woocommerce' ),
						'type'		=> 'checkbox',
						'label'		=> 'Enable this email notification',
						'default'	=> 'yes'
				),
				'subject'	=> array(
						'title'		=> __( 'Subject', 'woocommerce' ),
						'type'		=> 'text',
						'desc_tip'	=> true,
						'description'	=> sprintf( 'This controls the email subject line. Leave blank to use the default subject: <code>%s</code>.', $this->get_subject() ),
						'placeholder'	=> $this->get_default_subject(),
						'default'	=> ''
				),
				'heading'	=> array(
						'title'		=> __( 'Email Heading', 'woocommerce' ),
						'type'		=> 'text',
						'desc_tip'	=> true,
						'description'	=> sprintf( __( 'This controls the main heading contained within the email notification. Leave blank to use the default heading: <code>%s</code>.' ), $this->get_heading() ),
						'placeholder'	=> $this->get_default_heading(),
						'default'	=> ''
				),
				'email_type'	=> array(
						'title'		=> __( 'Email type', 'woocommerce'),
						'type'		=> 'select',
						'description'	=> __( 'Choose which format of email to send.', 'woocommerce' ),
						'default'	=> 'html',
						'class'		=> 'email_type wc-enhanced-select',
						'options'	=> $this->get_email_type_options(),
						'desc_tip'	=> true,
				)
			);
		} 
	}

endif;

return new Foundry_Code_Email();

?>