docs: @Nullable
      public Token createCvcUpdateTokenSynchronous(@NonNull String cvc,
                                                   @NonNull String publishableKey)
              throws AuthenticationException,
              InvalidRequestException,
              APIConnectionException,
              CardException,
              APIException {
          validateKey(publishableKey);
          final RequestOptions requestOptions = RequestOptions.builder(
                  publishableKey,
                  mStripeAccount,
                  RequestOptions.TYPE_QUERY).build();
          return mApiHandler.createToken(
                  mapFromCvc(cvc),
                  requestOptions,
                  Token.TYPE_CVC_UPDATE
          );
      }