Facebook for WooCommerce: Sync inventory count along with product

sv_fb_for_woocommerce_sync_priduct_inventory_count.php

<?php //only copy if required!

/*
 * Sync product inventory to Facebook
 */
function sv_facebook_for_woocommerce_integration_prepare_product( $product_data, $id ) {
	
	$product = wc_get_product( $id );
	
	// Get variation if variable product ID provided
	if ( 'variable' === $product->get_type() ) {

		if ( preg_match('/.*_(\d+)$/', $product_data[ 'retailer_id' ], $matches) ) {
			$product = wc_get_product( $matches[1] );
		}
	}
	
	if ( $product ) {
		$product_data[ 'inventory' ] = $product->get_stock_quantity();
	}
	
  	return $product_data;
}

add_filter( 'facebook_for_woocommerce_integration_prepare_product', 'sv_facebook_for_woocommerce_integration_prepare_product', 10, 2 );