private byte[] UseCodeService(Stream stream)
{
var codeToLookUp = _dataEncoder.DecodeUseCodeRequest(stream);
var response = _codes.CheckCode(codeToLookUp);
// In UseCode operation, the only case when any code changes its
// state is when an unused code is checked. So we save
// the codes in the storage only in such a case.
if (response == CodeState.NotUsed)
{
SaveCodesToStorage();
}
return(_dataEncoder.EncodeUseCodeResponse(response));
}
