code: @Deprecated
    protected byte[] getPayloadBytes(GenericRecord inputRecord) {
      try {
        return getFieldAsBytes(inputRecord, payloadField);
      } catch (Exception e) {
        return null;
      }
    }
docs: Get payload field and convert to byte array
  
  @param inputRecord the input record which has the payload
  @return the byte array of the payload in the input record
  @deprecated use {@link #getFieldAsBytes(GenericRecord, String)}