Repository: bitcoin/bitcoin
File: src/wallet/rpc/spend.cpp (C++)

Code before:
    mapValue_t mapValue;
    if (!request.params[3].isNull() && !request.params[3].get_str().empty())
        mapValue["comment"] = request.params[3].get_str();

    CCoinControl coin_control;
    if (!request.params[5].isNull()) {
        coin_control.m_signal_bip125_rbf = request.params[5].get_bool();
    }

    SetFeeEstimateMode(*pwallet, coin_control, /*conf_target=*/request.params[6], /*estimate_mode=*/request.params[7], /*fee_rate=*/request.params[8], /*override_min_fee=*/false);

    std::vector<CRecipient> recipients = CreateRecipients(
            ParseOutputs(sendTo),
            InterpretSubtractFeeFromOutputInstructions(request.params[4], sendTo.getKeys())
    );
    const bool verbose{request.params[9].isNull() ? false : request.params[9].get_bool()};

    return SendMoney(*pwallet, coin_control, recipients, std::move(mapValue), verbose);
},
    };
}

RPCHelpMan settxfee()
{
    return RPCHelpMan{"settxfee",
                "\nSet the transaction fee rate in " + CURRENCY_UNIT + "/kvB for this wallet. Overrides the global -paytxfee command line parameter.\n"
                "Can be deactivated by passing 0 as the fee. In that case automatic fee selection will be used by default.\n",
                {
                    {"amount", RPCArg::Type::AMOUNT, RPCArg::Optional::NO, "The transaction fee rate in " + CURRENCY_UNIT + "/kvB"},
                },
                RPCResult{
                    RPCResult::Type::BOOL, "", "Returns true if successful"
                },
                RPCExamples{
                    HelpExampleCli("settxfee", "0.00001")
            + HelpExampleRpc("settxfee", "0.00001")
                },
        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
{
    std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(request);
    if (!pwallet) return UniValue::VNULL;

    LOCK(pwallet->cs_wallet);

    CAmount nAmount = AmountFromValue(request.params[0]);
    CFeeRate tx_fee_rate(nAmount, 1000);
    CFeeRate max_tx_fee_rate(pwallet->m_default_max_tx_fee, 1000);
    if (tx_fee_rate == CFeeRate(0)) {
        // automatic selection
    } else if (tx_fee_rate < pwallet->chain().relayMinFee()) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("txfee cannot be less than min relay tx fee (%s)", pwallet->chain().relayMinFee().ToString()));

Review comment (suggestion):
nit
```suggestion
                "\n(DEPRECATED) Set the transaction fee rate in " + CURRENCY_UNIT + "/kvB for this wallet. Overrides the global -paytxfee command line parameter.\n"
```

Code after:
    mapValue_t mapValue;
    if (!request.params[3].isNull() && !request.params[3].get_str().empty())
        mapValue["comment"] = request.params[3].get_str();

    CCoinControl coin_control;
    if (!request.params[5].isNull()) {
        coin_control.m_signal_bip125_rbf = request.params[5].get_bool();
    }

    SetFeeEstimateMode(*pwallet, coin_control, /*conf_target=*/request.params[6], /*estimate_mode=*/request.params[7], /*fee_rate=*/request.params[8], /*override_min_fee=*/false);

    std::vector<CRecipient> recipients = CreateRecipients(
            ParseOutputs(sendTo),
            InterpretSubtractFeeFromOutputInstructions(request.params[4], sendTo.getKeys())
    );
    const bool verbose{request.params[9].isNull() ? false : request.params[9].get_bool()};

    return SendMoney(*pwallet, coin_control, recipients, std::move(mapValue), verbose);
},
    };
}

RPCHelpMan settxfee()
{
    return RPCHelpMan{"settxfee",
                "\n(DEPRECATED) Set the transaction fee rate in " + CURRENCY_UNIT + "/kvB for this wallet. Overrides the global -paytxfee command line parameter.\n"
                "Can be deactivated by passing 0 as the fee. In that case automatic fee selection will be used by default.\n",
                {
                    {"amount", RPCArg::Type::AMOUNT, RPCArg::Optional::NO, "The transaction fee rate in " + CURRENCY_UNIT + "/kvB"},
                },
                RPCResult{
                    RPCResult::Type::BOOL, "", "Returns true if successful"
                },
                RPCExamples{
                    HelpExampleCli("settxfee", "0.00001")
            + HelpExampleRpc("settxfee", "0.00001")
                },
        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
{
    std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(request);
    if (!pwallet) return UniValue::VNULL;

    LOCK(pwallet->cs_wallet);

    if (!pwallet->chain().rpcEnableDeprecated("settxfee")) {
        throw JSONRPCError(RPC_METHOD_DEPRECATED, "settxfee is deprecated and will be fully removed in v31.0."
        "\nTo use settxfee restart bitcoind with -deprecatedrpc=settxfee.");
    }

    CAmount nAmount = AmountFromValue(request.params[0]);
    CFeeRate tx_fee_rate(nAmount, 1000);