woocommerce_register_form_start │ action-hook │ WC 1.0

Usage

add_action( 'woocommerce_register_form_start', 'wp_kama_woocommerce_register_form_start_action' );

/**
 * Function for `woocommerce_register_form_start` action-hook.
 * 
 * @return void
 */
function wp_kama_woocommerce_register_form_start_action(){

	// action...
}

Where the hook is called

<?php do_action( 'woocommerce_register_form_start' ); ?>

Where the hook is used in WooCommerce