Available from version 1.23.0 (Gerrit change 106844)
Removed in version 1.27.0
Allows modifying the internal login form when creating an account via the API.
Define function:
public static function onAddNewAccountApiForm( $apiModule, $loginForm ) { ... }
Attach hook: In extension.json:
	"Hooks": {
		"AddNewAccountApiForm": "MediaWiki\\Extension\\MyExtension\\Hooks::onAddNewAccountApiForm"
Called from: File(s): api/ApiCreateAccount.php
Interface: AddNewAccountApiFormHook.php

For more information about attaching hooks, see Manual:Hooks .
For examples of extensions using this hook, see Category:AddNewAccountApiForm extensions.