public function get_providers_for_post( $post_id ) {
		$providers = [];
		$modules = $this->ticket_class;

		foreach ( $modules as $class => $module ) {
			$obj              = call_user_func( [ $class, 'get_instance' ] );
			$provider_tickets = $obj->get_tickets( $post_id );

			if ( ! empty( $provider_tickets ) ) {
				$providers[ $module['slug'] ] = $class;
			}
		}

		return $providers;
	}