Membership notify me on expiry

Email Admin.php

add_action( 'membership_expire_subscription', 'notify_expiry', 10, 2 );
	function notify_expiry( $sub_id, $user_id ) {
		$user = get_userdata($user_id);
		// You can also filter only specific subscriptions here
                $sub = Membership_Plugin::factory()->get_subscription( $sub_id );
		// Put your email here
		$to = 'put_your_email@here.com' ; 
		$subject = "Membership Expiry" ; 
                // Format email content if needed 
		$message = sprintf(__( '<strong>%s</strong> has left subscription <strong>%s</strong>','membership' ), $user->display_name, $sub->sub_name() );

		wp_mail( $to, $subject, $message );
	}