EDITED 2019-02-08

`maxTxFee` is a global variable, used by both the raw transaction and wallet RPCs. It's set from `-maxtxfee`.

~listed in the global help text in init.cpp, but is only set in `WalletInit::ParameterInteraction()`. If the wallet is disabled, then `-maxtxfee` is ignored and the default is used.~

~This behaviour has existed since the mempool was changed to limit acceptance based on `maxTxFee` in https://github.com/bitcoin/bitcoin/commit/fa331db68bcc68e4c93fb45aaa30f911b0ecfe1a.~

~Short-term fix is to move the `-maxtxfee` handling to `InitParameterInteraction()` in init.cpp.~
EDIT: `maxTxFee` initiation bug fixed in #15357 

I don't think we should share this setting between the node and wallet.
{
    for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
        pwallet->postInitProcess();
    }
    
    scheduler.scheduleEvery(MaybeCompactWalletDB, 500);
}
void FlushWallets()
{
    for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
        pwallet->Flush(false);
    }
}
void StopWallets()
{
    for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
        pwallet->Flush(true);
    }
}
void UnloadWallets()
{
    auto wallets = GetWallets();
    while (!wallets.empty()) {
        auto wallet = wallets.back();
        wallets.pop_back();
        RemoveWallet(wallet);
        UnloadWallet(std::move(wallet));
    }
}