/**
  * Increments the total value which we pay the server.
  *
  * @param size How many satoshis to increment the payment by (note: not the new total).
  * @throws ValueOutOfRangeException If the size is negative or would pay more than this channel's
  *     total value ({@link PaymentChannelClientConnection#state()}.getTotalValue())
  * @throws IllegalStateException If the channel has been closed or is not yet open (see {@link
  *     PaymentChannelClientConnection#getChannelOpenFuture()} for the second)
  */
 public ListenableFuture<BigInteger> incrementPayment(BigInteger size)
     throws ValueOutOfRangeException, IllegalStateException {
   return channelClient.incrementPayment(size);
 }