WooCommerce Subscriptions - Incorrect Price Filtering on Upgrade/Downgrade

Overview of the issue

In WooCommerce Subscriptions, when updating a subscription (whether it’s an upgrade, downgrade, or crossgrade), the price isn’t filtered correctly. This results in incorrect pricing during the change of subscription plans.

Workaround

Please, make sure of having a full backup of your site before proceeding.

• Open …/wp-content/plugins/woocommerce-multilingual/compatibility/WcSubscriptions/MulticurrencyHooks.php file.
• Look for line 253.
• Change:

  	public function woocommerce_subscription_price_from( $price, $product ) {
  		if ( $product instanceof WC_Product_Subscription_Variation ) {
  			$customPricesOn = get_post_meta( $product->get_id(), '_wcml_custom_prices_status', true );
  
  			if ( $customPricesOn ) {
  				$price = get_post_meta( $product->get_id(), '_price_' . $this->woocommerce_wpml->multi_currency->get_client_currency(), true );
  			} else {
  				$price = apply_filters( 'wcml_raw_price_amount', $price );
  			}
  		}
  
  		return $price;
  	}
  

• For:

  	public function woocommerce_subscription_price_from( $price, $product ) {
  		if ( $product instanceof WC_Product_Subscription_Variation || $product instanceof \WC_Product_Subscription) {
  			$customPricesOn = get_post_meta( $product->get_id(), '_wcml_custom_prices_status', true );
  
  			if ( $customPricesOn ) {
  				$price = get_post_meta( $product->get_id(), '_price_' . $this->woocommerce_wpml->multi_currency->get_client_currency(), true );
  			} else {
                  $id = $product->get_id();
                  $type = get_post_type($id);
  				$trid = apply_filters( 'wpml_element_trid', NULL, $id,  'post_'.$type );
  				$translations = apply_filters( 'wpml_get_element_translations', NULL, $trid , 'post_'.$type );
                  foreach ($translations as $translation){
                      if ($translation->original == 1){
                          if ( get_post_meta( $translation->element_id, '_wcml_custom_prices_status', true ) ) {
  	                        $price = get_post_meta( $translation->element_id, '_price_' . $this->woocommerce_wpml->multi_currency->get_client_currency(), true );
                          } else {
  	                        $price = apply_filters( 'wcml_raw_price_amount', $price );
                          }
                      }
                  }
              }
  		}
  
  		return (int)$price;
  	}