Convert BigCommerce category IDs to WordPress category IDs

bc_cats_to_wp_cats.php

<?php

function bc_cats_to_wp_cats( $category_ids ) {
		$query = new \WP_Term_Query();

		return $query->query( [
			'taxonomy'   => \BigCommerce\Taxonomies\Product_Category\Product_Category::NAME,
			'meta_query' => [
				[
					'key'     => 'bigcommerce_id',
					'value'   => $category_ids,
					'compare' => 'IN',
				],
			],
			'hide_empty' => false,
			'fields'     => 'ids'
		] );
}