SDK does not support pre-auth workflow

[DoDSoftware]

The SDK has hardcoded validation rules for all the models. In the Pre-auth workflow, we do not have a payment_details.avs_result_code or payment_details.cvv_result_code. We were advised to omit the keys or pass null. Unfortunately, doing either results in an exception being thrown in the PHP SDK as both properties are hard coded to be required and match this regex: /^.+$/i