Which is the correct IoT pre-provisioning hook Lambda response to RegisterThing (MQTT)?

Hi, I found this document that might help you.

Pre-provision hook return value

The Lambda function must return a response that indicates whether it has authorized the provisioning request and the values of any properties to override.

The following is an example of a successful response from the pre-provisioning function.

{
    "allowProvisioning": true,
    "parameterOverrides" : {
        "Key": "newCustomValue",
        ...
    }
}