WordPress at a glance
action is not described

woocommerce_register_post action-hook . WC 1.0

Use WP_Error to handle registration errors.

Usage

add_action( 'woocommerce_register_post', 'action_function_name_7880', 10, 3 );
function action_function_name_7880( $username, $email, $errors ){
	// action...
}
$username
-
$email
-
$errors
-

Where the hook is called

wc_create_new_customer()
woocommerce_register_post
CreateAccount::create_customer_account()
woocommerce_register_post
woocommerce/includes/wc-user-functions.php 78
do_action( 'woocommerce_register_post', $username, $email, $errors );
woocommerce/packages/woocommerce-blocks/src/Domain/Services/CreateAccount.php 229
do_action( 'woocommerce_register_post', $username, $user_email, $errors );

Where in WP core the hook is used WooCommerce

Usage not found.