WordPress at a glance
function is not described

Automattic\WooCommerce\Admin\Notes\MerchantEmailNotifications

NotificationEmail::init_form_fields() public WC 1.0

This email has no user-facing settings.

{} It's a method of the class: NotificationEmail{}

No Hooks.

Return

null. Nothing.

Usage

$NotificationEmail = new NotificationEmail();
$NotificationEmail->init_form_fields();

Code of NotificationEmail::init_form_fields() WC 5.3.0

<?php
public function init_form_fields() {}