CustomDeserializer.java

public class CustomDeserializer {
    
    public class ResponseWrapper {
        public Integer defaultValue; // Reserved keyword mapping
        // Add other properties here
    }
    
    public static ResponseWrapper deserializeResponse(String jsonString) {
        Map<String, Object> jsonMap = (Map<String, Object>) JSON.deserializeUntyped(jsonString);
        
        ResponseWrapper wrapper = new ResponseWrapper();
        wrapper.defaultValue = (Integer) jsonMap.get('default');
        // Add other property mappings here
        
        return wrapper;
    }
}