f2a09ea10ea1456c9401879b3a415bbd00875839
Updated the `DocumentCreateCommand` record to include a nullable `DataAsBase64` property for better encapsulation. Enhanced the `EnvelopeReceiverController` with logic to validate document data, ensuring that either `DataAsBase64` or `DataAsByte` is provided, but not both. Introduced a new static method `IsBase64String` to validate base64 string format.
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