- Refactor Response struct's parse method to return detailed error messages based on API error codes.
- Introduce UnixTime type for handling Unix timestamps in JSON marshaling and unmarshaling.
- Add email masking utility function to obfuscate email addresses for privacy.
- Implement containsValueInStruct function to check for substring presence in struct fields.
- Create comprehensive unit tests for UnixTime, email masking, and struct value checking.
- Update vehicle service request method documentation for clarity.
