private synchronized void deleteChannelFromWallet() {
   log.info("Close tx has confirmed, deleting channel from wallet: {}", storedChannel);
   StoredPaymentChannelClientStates channels =
       (StoredPaymentChannelClientStates)
           wallet.getExtensions().get(StoredPaymentChannelClientStates.EXTENSION_ID);
   channels.removeChannel(storedChannel);
   wallet.addOrUpdateExtension(channels);
   storedChannel = null;
 }
 @VisibleForTesting
 synchronized void doStoreChannelInWallet(Sha256Hash id) {
   StoredPaymentChannelClientStates channels =
       (StoredPaymentChannelClientStates)
           wallet.getExtensions().get(StoredPaymentChannelClientStates.EXTENSION_ID);
   checkNotNull(
       channels,
       "You have not added the StoredPaymentChannelClientStates extension to the wallet.");
   checkState(channels.getChannel(id, multisigContract.getHash()) == null);
   storedChannel =
       new StoredClientChannel(id, multisigContract, refundTx, myKey, valueToMe, refundFees, true);
   channels.putChannel(storedChannel);
   wallet.addOrUpdateExtension(channels);
 }