public function __construct() {
		parent::__construct();

		$this->attendee_provider = tribe( 'tickets.commerce.paypal' );

		$this->create_args['post_type'] = $this->attendee_provider->attendee_object;

		// Use a regular variable so we can get constants from it in a PHP <7.0 compatible way.
		$attendee_provider = $this->attendee_provider;

		// Add object specific aliases.
		$this->update_fields_aliases = array_merge(
			$this->update_fields_aliases,
			[
				'ticket_id'       => $attendee_provider::ATTENDEE_PRODUCT_KEY,
				'event_id'        => $attendee_provider::ATTENDEE_EVENT_KEY,
				'post_id'         => $attendee_provider::ATTENDEE_EVENT_KEY,
				'security_code'   => $attendee_provider->security_code,
				'order_id'        => $attendee_provider->order_key,
				'optout'          => $attendee_provider->attendee_optout_key,
				'user_id'         => $attendee_provider->attendee_user_id,
				'price_paid'      => $attendee_provider->price_paid,
				'price_currency'  => $attendee_provider->price_currency,
				'full_name'       => $attendee_provider->full_name,
				'email'           => $attendee_provider->email,
				'attendee_status' => $attendee_provider->attendee_tpp_key,
				'refund_order_id' => $attendee_provider->refund_order_key,
			]
		);
	}