Displays and handles the login form used to unlock the store. The form is added via a shortcode.
SHORTCODE
$form_id :
register()
handle_login()
do_shortcode( $atts, $content = '')
get_password_form( $message = '')
get_error_message( $form_id)
login_redirect()
set_password_cookie( $password)
validate_password( $password)