class-wc-deposits-product-meta.php

<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * WC_Deposits_Product_Meta class.
 * @since  1.2
 */
class WC_Deposits_Product_Meta {

	/** @var object Class Instance */
	private static $instance;

	/**
	 * Get the class instance.
	 */
	public static function get_instance() {
		return null === self::$instance ? ( self::$instance = new self ) : self::$instance;
	}

	/**
	 * Gets a piece of product meta in a version agnostic way.
	 *
	 * @param  int|WC_Product $product
	 * @param  string         $meta_key
	 * @return mixed
	 */
	public static function get_meta( $product, $meta_key ) {
		if ( is_object( $product ) ) {
			$product_id = $product->get_id();
		} else {
			$product_id = $product;
		}

		if ( version_compare( WC_VERSION, '2.7', '<' ) ) {
			return get_post_meta( $product_id, $meta_key, true );
		} else {
			if ( is_numeric( $product ) ) {
				$product = wc_get_product( $product );
			}
			return $product->get_meta( $meta_key, true );
		}
	}

	/**
	 * Update a piece of product meta in a version agnostic way.
	 *
	 * @param  int|WC_Product $product
	 * @param  string         $meta_key
	 * @param  mixed          $meta_value
	 */
	public static function update_meta( $product, $meta_key, $meta_value ) {
		if ( is_object( $product ) ) {
			$product_id = $product->get_id();
		} else {
			$product_id = $product;
		}

		if ( version_compare( WC_VERSION, '2.7', '<' ) ) {
			update_post_meta( $product_id, $meta_key, $meta_value );
		} else {
			if ( is_numeric( $product ) ) {
				$product = wc_get_product( $product );
			}
			$product->update_meta_data( $meta_key, $meta_value );
			$product->save_meta_data();
		}
	}
}

WC_Deposits_Product_Meta::get_instance();