Motors WordPress plugin add car data to Post to Google My Business plugin

snippet_motors_car_data.php

<?php
if(interface_exists('\PGMB\Placeholders\VariableInterface')){
	class PGMB_Motors_Variables implements \PGMB\Placeholders\VariableInterface {

		private $listing_id;

		public function __construct($listing_id){
			$this->listing_id = $listing_id;
		}
		/**
		 * @return array Variable => Replacement
		 */
		public function variables(){
			$years = get_the_terms($this->listing_id, 'ca-year');
			$year = is_array($years) ? $years[0]->name : '';

			return [
				'%motors_price%'        => get_post_meta($this->listing_id, 'price', true),
				'%motors_sale_price%'   => get_post_meta($this->listing_id, 'sale_price', true),
				'%motors_seller_notes%'  => get_post_meta($this->listing_id, 'stm_seller_notes', true),
				'%motors_car_year%'     => $year
			];
		}
	}
}



function pgmb_motors_variables($decorators, $parent_post_id, $location){
	if('listings' !== get_post_type($parent_post_id) || !class_exists('PGMB_Motors_Variables')){
		return $decorators;
	}
	$decorators[] = new PGMB_Motors_Variables($parent_post_id);
	return $decorators;
}

add_filter('mbp_placeholder_decorators', 'pgmb_motors_variables', 10, 3);