Action: wu_handle_user_meta_fields

Allow plugin developers to save user meta data in different ways if they need to.

Parameters

Name	Type	Description
$meta_repository	`array`	The list of meta fields, key => value structured.
$user	`\WP_User`	The WordPress user object.
$customer	`\Customer`	The Ultimate Multisite customer object.
$checkout	`\Checkout`	The checkout class.