code: public Collection<ProposalResponse> sendTransactionProposal(TransactionProposalRequest transactionProposalRequest) throws ProposalException, InvalidArgumentException {
  
          return sendProposal(transactionProposalRequest, getEndorsingPeers());
      }
docs: Send a transaction  proposal.
  
  @param transactionProposalRequest The transaction proposal to be sent to all the required peers needed for endorsing.
  @return responses from peers.
  @throws InvalidArgumentException
  @throws ProposalException