Commerce setting lock

For security reasons, payment method configurations can be define in the site's setting.php file instead of storing them in the database using the code below.

$conf['payment_method_instance_id']['settings']['property'] = 'value';

Example:
$conf['authnet_aim|commerce_payment_authnet_aim']['tran_key'] = 'YourTransactionKey';

However, when saving the payment configuration from the back office, those configurations are imported back to the database. This module will prevent the configurations defined in the settings.php file from being imported back to the database.