From 57303f1c0656817c0b80f20211423e50b9698a1b Mon Sep 17 00:00:00 2001
From: michilumin <skunkie@gmail.com>
Date: Fri, 6 Aug 2021 18:17:14 -0600
Subject: [PATCH] Adding startup logic where -paytxfee if lower than default,
 implies -mintxfee is also lowered.

---
 src/wallet/wallet.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index d9187e383..9ad4fb7f0 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -3894,6 +3894,13 @@ bool CWallet::ParameterInteraction()
             return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
                                        GetArg("-paytxfee", ""), ::minRelayTxFeeRate.ToString()));
         }
+
+	    // if -mintxfee is not set, then a lower payTxFee overrides minTxFee
+	    if (!IsArgSet("-mintxfee") && payTxFee < CWallet::minTxFee)
+        {
+            LogPrintf("%s: parameter interaction: -paytxfee=%s -> setting -mintxfee=%s\n", __func__, GetArg("-paytxfee",""), GetArg("-paytxfee",""));        
+            CWallet:minTxFee = CFeeRate(nFeePerK,1000);
+        }
     }
     if (IsArgSet("-maxtxfee"))
     {