rpc_tx_handling.cpp

// Not a RPC call at all!
Value HandleTxCreation(const Array& params) {
    bool fBroadcast = params.back().get_bool();

    // actual implemenation
    // ...
}

// RPC call for creation
Value tx_create(const Array& params, bool fHelp)
{
    if (fHelp || params.size() < 4 || params.size() > 6)
        throw std::runtime_error(
            "tx_create ... ... ... ... ..."
        );

    // push some fillers to blank the default params maybe?
    // push broadcasting flag
    params.push_back(false);

    return HandleTxCreation(params);
}

// RPC call for broadcasting
Value tx_broadcast(const Array& params, bool fHelp)
{
    if (fHelp || params.size() < 4 || params.size() > 6)
        throw std::runtime_error(
            "tx_broadcast ... ... ... ... ..."
        );

    // push some fillers to blank the default params maybe?
    // push broadcasting flag
    params.push_back(true);

    return HandleTxCreation(params);
}