code: public ChainCodeResponse invoke(InvokeRequest invokeRequest) throws ChainCodeException, NoAvailableTCertException, CryptoException, IOException {
          logger.debug("Member.invoke");
  
          if (getChain().getPeers().isEmpty()) {
          	throw new NoValidPeerException(String.format("chain %s has no peers", getChain().getName()));
          }
  
          TransactionContext tcxt = this.newTransactionContext(null);
          return tcxt.invoke(invokeRequest);
      }
docs: Issue a invoke request on behalf of this member
  @param invokeRequest {@link InvokeRequest}
  @throws ChainCodeException if the chain code invocation fails