woocommerce_order_button_text │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_order_button_text', 'wp_kama_woocommerce_order_button_text_filter' );

/**
 * Function for `woocommerce_order_button_text` filter-hook.
 * 
 * @param  $__ 
 *
 * @return 
 */
function wp_kama_woocommerce_order_button_text_filter( $__ ){

	// filter...
	return $__;
}

$__

-

Where the hook is called

'order_button_text'  => apply_filters( 'woocommerce_order_button_text', __( 'Place order', 'woocommerce' ) ),

Where the hook is used in WooCommerce