Add Commodity Codes to Stripe

/**

 * Add a commodity code to all line items sent to Stripe.

 *

 * @param string|null $code The commodity code.

 * @param int $download_id The download ID.

 * @param array $cart_item The cart item.

 * @return string|null The commodity code.

 */

function eddwp_add_commodity_code_to_line_items( $code, $download_id, $cart_item ) {

	$download = edd_get_download( $download_id );

	return $download ? '81161500' : null; // Software licensing

}

add_filter( 'edds_line_item_commodity_code', 'eddwp_add_commodity_code_to_line_items', 10, 3 );