lifterlms_user_{$action}_required_data
Filter Hook: Filter the required fields validity of the form submission
Source: includes/forms/class-llms-form-handler.php:378
LLMS_Forms_Dynamic_Fields::add_password_strength_meter()
Method: Adds a password strength meter to a block list
Source: includes/forms/class-llms-forms-dynamic-fields.php:76
LLMS_Controller_Orders::create_pending_order()
Method: Handle form submission of the checkout / payment form
Source: includes/controllers/class.llms.controller.orders.php:211