diff --git a/checksum.go b/checksum.go
index 6948c9c..3901dd1 100644
--- a/checksum.go
+++ b/checksum.go
@@ -64,7 +64,7 @@ func md5RpnForm(r RpnOut, md5key string) string {
 	s += "user_name=" + r.User_name + "|"
 	s += "user_cardno=" + r.User_cardno + "|"
 	s += "key=" + md5key
-	fmt.Println(s)
-	fmt.Println(md5str(s))
+	// fmt.Println(s)
+	// fmt.Println(md5str(s))
 	return md5str(s)
 }
diff --git a/db.go b/db.go
index 3e511bf..c6988a1 100644
--- a/db.go
+++ b/db.go
@@ -21,9 +21,11 @@ func (m *TransactionDB) conn(c AppConfig) error {
 	dbUser := c.DB.User
 	dbPass := c.DB.Pass
 	dbName := c.DB.Schema
-	h, err := sql.Open(dbDriver, dbUser+":"+dbPass+"@/"+dbName+"?parseTime=true")
+	dbURL := dbUser + ":" + dbPass + "@/" + dbName + "?parseTime=true"
+	h, err := sql.Open(dbDriver, dbURL)
 	if err != nil {
 		m.h = nil
+		log.Println("ERROR: open database " + dbDriver + " " + dbURL + " " + err.Error())
 		panic(err.Error())
 	}
 	m.h = h
@@ -59,18 +61,19 @@ func (m *TransactionDB) addRequest(r *http.Request, md5key string) (row Leanwork
 
 	insForm, err := m.h.Prepare("INSERT INTO leanworkIn (pickupUrl, receiveUrl, signType, orderNo, orderAmount, orderCurrency, customerId, sign, valid, ip4, md5key) VALUES(?,?,?,?,?,?,?,?,?,?,?)")
 	if err != nil {
-		log.Printf("Failed to prepare SQL statment for insert")
+		log.Printf("Failed to prepare SQL statment for insert LeanworkIn")
 		return
 	}
 
 	res, err := insForm.Exec(pickupUrl, receiveUrl, signType, orderNo, orderAmount, orderCurrency, customerId, sign, valid, ip4, md5key)
 	if err != nil {
-		log.Printf("Error inserting leanworkIn with orderNo =%s \n", orderNo)
+		log.Printf("Error inserting leanworkIn with orderNo =%s \n%+v\n%s", orderNo, r.Form, err.Error())
 		return
 	}
 
 	id, err := res.LastInsertId()
 	if err != nil {
+		log.Printf("Cannot Get lastinsert ID for %+v, error= %s\n", r.Form, err.Error())
 		return
 	}
 
@@ -104,6 +107,7 @@ func (m *TransactionDB) logNewLeanworkIn(row LeanworkIn) {
 
 func (m *TransactionDB) addRpnOut(r RpnOut) (row RpnOut, err error) {
 	if err = m.conn(Config); err != nil {
+		log.Printf("ERROR adding RpnOut Failed, DB error, RPNOut %+v, Error: %s\n", r, err.Error())
 		return row, err
 	}
 	defer m.close()
@@ -137,11 +141,13 @@ func (m *TransactionDB) addRpnOut(r RpnOut) (row RpnOut, err error) {
 		user_id, user_name, user_cardno, signature, leanwork, ip4)
 	if err != nil {
 		log.Println("Failed to execute sql statment for insert RpnOut order_id=" + r.Order_id + " " + err.Error())
+		log.Printf("%+v", r)
 		return
 	}
 	id, err := res.LastInsertId()
 	if err != nil {
 		log.Println("Cannot get last insert ID with new RpnOut record")
+		log.Printf("%+v\n", r)
 		return
 	}
 	row = r
diff --git a/debug.go b/debug.go
index 9045401..fa07f45 100644
--- a/debug.go
+++ b/debug.go
@@ -1,13 +1,12 @@
 package main
 
 import (
-	"fmt"
 	"log"
 )
 
 func logRequestDebug(data []byte, err error) {
 	if err == nil {
-		fmt.Printf("%s\n\n", string(data))
+		log.Printf("%s\n\n", string(data))
 	} else {
 		log.Fatalf("%s\n\n", err)
 	}
diff --git a/leanworkIn.go b/leanworkIn.go
index c040095..e6832ed 100644
--- a/leanworkIn.go
+++ b/leanworkIn.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"errors"
+	"log"
 	"time"
 )
 
@@ -43,6 +44,7 @@ func getRequestRowByIdAndSign(id string, sign string) (row LeanworkIn, err error
 	defer db.close()
 	selDB, err := db.h.Query("SELECT * FROM leanworkIn WHERE id=? and sign=?", id, sign)
 	if err != nil {
+		log.Printf("Trying to get LeanworkIn id=%s, sign=%s, with Error:%s\n", id, sign, err.Error())
 		return
 	}
 	count := 0
@@ -51,8 +53,12 @@ func getRequestRowByIdAndSign(id string, sign string) (row LeanworkIn, err error
 			&row.OrderNo, &row.OrderAmount, &row.OrderCurrency, &row.CustomerId,
 			&row.Sign, &row.Valid, &row.Ts, &row.Ip4, &row.Ip4Location, &row.MD5Key)
 		if err != nil {
+			log.Printf("Cannot Retrieve LeanworkIn Record for id=%s, sign=%s, Error=%s", id, sign, err.Error())
 			return
 		}
+		if count >= 1 {
+			log.Printf("WARNING: LeanworkIn has %d  id=%s and sign=%s \n", count, id, sign)
+		}
 		count++
 	}
 
diff --git a/leanworkOut.go b/leanworkOut.go
index 9373a2f..fcda9b3 100644
--- a/leanworkOut.go
+++ b/leanworkOut.go
@@ -54,14 +54,16 @@ func (m *LeanworkOut) DoHttp() (retry bool, err error) {
 		bodyBytes, err := ioutil.ReadAll(resp.Body)
 		if err != nil {
 			log.Println("Fatal: Cannot read leanwork Http Response " + err.Error())
-		}
-		bodyString := string(bodyBytes)
-		m.LeanworkResp = bodyString
-		m.add2db()
-		if strings.Contains(strings.ToLower(bodyString), "success") {
-			retry = false
 		} else {
-			log.Println("Leanwork response without success word : " + bodyString)
+			bodyString := string(bodyBytes)
+			m.LeanworkResp = bodyString
+			m.add2db()
+			if strings.Contains(strings.ToLower(bodyString), "success") {
+				log.Printf("Leanwork Out [%d]: orderNo=%s, %s %s success\n", m.Leanwork, m.OrderNo, m.OrderCurrency, m.OrderAmount)
+				retry = false
+			} else {
+				log.Println("Leanwork response without 'success' : " + bodyString)
+			}
 		}
 		retry = false
 	}
@@ -93,6 +95,7 @@ func startLeanworkCallBack(ri RpnIn) {
 func buildLeanworkOutByRpnIn(ri RpnIn) (ret LeanworkOut, err error) {
 	li, err := getLeanworkInById(ri.Leanwork)
 	if err != nil {
+		log.Println("cannot get LeanworkIn by ID %s, %s", ri.Leanwork, err.Error())
 		return
 	}
 	ret.Leanwork = ri.Leanwork
@@ -118,7 +121,7 @@ func (m *LeanworkOut) UpdateSignature() {
 func (m *LeanworkOut) getLeanworkMD5Key() string {
 	li, err := getLeanworkInById(m.Leanwork)
 	if err != nil {
-		log.Printf("Error determin P2P or FAT, leanworkIn = %d", m.Leanwork)
+		log.Printf("ERROR unknown P2P or FAT, leanworkIn id= %d", m.Leanwork)
 		return ""
 	}
 	return li.MD5Key
@@ -126,6 +129,7 @@ func (m *LeanworkOut) getLeanworkMD5Key() string {
 
 func (m *LeanworkOut) add2db() (ret LeanworkOut, err error) {
 	if err = db.conn(Config); err != nil {
+		log.Println("ERROR cannot addd LeanwokOut, db conn error " + err.Error())
 		return
 	}
 	defer db.close()
@@ -145,12 +149,12 @@ func (m *LeanworkOut) add2db() (ret LeanworkOut, err error) {
 		m.TransactionId, m.Status, m.Sign, m.LeanworkResp)
 
 	if err != nil {
-		log.Printf("Error inserting leanworkOut with orderNo =%s, %s \n", m.OrderNo, err.Error())
+		log.Printf("Error inserting leanworkOut with orderNo =%s, %s %s %s \n", m.OrderNo, m.OrderCurrency, m.OrderAmount, err.Error())
 		return
 	}
 	id, err := res.LastInsertId()
 	if err != nil {
-		log.Printf("Cannot retrieve lastInsertId for orderID %s", m.OrderNo)
+		log.Printf("Cannot retrieve lastInsertId for orderID %s, %s %s", m.OrderNo, m.OrderCurrency, m.OrderAmount)
 		return
 	}
 
diff --git a/main.go b/main.go
index 23606f9..1cd0a47 100644
--- a/main.go
+++ b/main.go
@@ -32,8 +32,9 @@ func main() {
 	http.HandleFunc("/", fs)
 
 	//start listening
-	log.Println("Server started on: http://localhost:8080")
-	http.ListenAndServe(Config.Server.Host+":"+Config.Server.Port, nil)
+	svr := Config.Server.Host + ":" + Config.Server.Port
+	log.Println("Server started on: " + svr)
+	http.ListenAndServe(svr, nil)
 
 	//program never reach here.
 }
diff --git a/purchase.go b/purchase.go
index 3e31551..71bdd13 100644
--- a/purchase.go
+++ b/purchase.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"net/http/httputil"
 	"text/template"
 )
 
@@ -52,6 +53,8 @@ func choosePayment(w http.ResponseWriter, r *http.Request) {
 //leanwork in for alipay
 func leanworkInFAT(w http.ResponseWriter, r *http.Request) {
 	if r.Method != "POST" {
+		log.Println("Invalid Request expect POST for leanworkInFAT")
+		logRequestDebug(httputil.DumpRequest(r, true))
 		errPage(w, http.StatusMethodNotAllowed, "invalid method")
 		return
 	}
@@ -59,6 +62,8 @@ func leanworkInFAT(w http.ResponseWriter, r *http.Request) {
 
 	row, err := db.addRequest(r, Config.LeanWork.MD5FAT)
 	if err != nil {
+		log.Printf("ERROR failed to add leanworkIn %+v \n", r.Form)
+		logRequestDebug(httputil.DumpRequest(r, true))
 		errPage(w, http.StatusInternalServerError, "Cannot initiate database transaction for incoming request")
 		return
 	}
@@ -67,6 +72,8 @@ func leanworkInFAT(w http.ResponseWriter, r *http.Request) {
 		// w.WriteHeader(http.StatusMethodNotAllowed)
 		// fmt.Fprintf(w, "invalid request")
 		errPage(w, http.StatusBadRequest, "validation of FAT input parameters failed")
+		log.Printf("Invalid Request received, Signature is not correct")
+		logRequestDebug(httputil.DumpRequest(r, true))
 		return
 	}
 
@@ -78,6 +85,8 @@ func leanworkInFAT(w http.ResponseWriter, r *http.Request) {
 
 func leanworkInP2P(w http.ResponseWriter, r *http.Request) {
 	if r.Method != "POST" {
+		log.Println("Invalid P2P Request expect POST for leanworkInP2P")
+		logRequestDebug(httputil.DumpRequest(r, true))
 		errPage(w, http.StatusMethodNotAllowed, "invalid method")
 		return
 	}
@@ -94,6 +103,8 @@ func leanworkInP2P(w http.ResponseWriter, r *http.Request) {
 		// w.WriteHeader(http.StatusMethodNotAllowed)
 		// fmt.Fprintf(w, "invalid request")
 		errPage(w, http.StatusBadRequest, "validation of P2P input parameters failed")
+		log.Printf("Invalid Request received, Signature is not correct")
+		logRequestDebug(httputil.DumpRequest(r, true))
 		return
 	}
 
diff --git a/purchase_debug.go b/purchase_debug.go
index 8a107d4..c050ddc 100644
--- a/purchase_debug.go
+++ b/purchase_debug.go
@@ -17,6 +17,7 @@ func buildLeanworkOutByIn(in LeanworkIn) (ret LeanworkOut) {
 	return
 }
 
+//directly send leanwork success without contacting RPN
 func debugStartLeanworkCallBack(li LeanworkIn) {
 	lo := buildLeanworkOutByIn(li)
 
diff --git a/rpn.go b/rpn.go
index 8e3542f..f9a570c 100644
--- a/rpn.go
+++ b/rpn.go
@@ -7,16 +7,20 @@ import (
 	"net/http/httputil"
 )
 
+//RPN callback us about payment result
 func rpnNotify(w http.ResponseWriter, r *http.Request) {
-	logRequestDebug(httputil.DumpRequest(r, true))
 
 	if r.Method != "POST" {
 		errPage(w, http.StatusMethodNotAllowed, "invalid request")
+		log.Println("ERROR RPN request,not HTTP POST")
+		logRequestDebug(httputil.DumpRequest(r, true))
 		return
 	}
 	ri, err := GetRpnInFromHTTPRequest(r) //ParseForm called
 	if err != nil {
 		errPage(w, http.StatusBadRequest, "invalid parameters "+err.Error())
+		log.Println("ERROR bad request, err=" + err.Error())
+		logRequestDebug(httputil.DumpRequest(r, true))
 		return
 	}
 
@@ -25,6 +29,7 @@ func rpnNotify(w http.ResponseWriter, r *http.Request) {
 	_, err = ri.add2db() //TODO:check error add
 	if err != nil {
 		log.Printf("failed to add rpnIn %+v , error is %s", ri, err.Error())
+		logRequestDebug(httputil.DumpRequest(r, true))
 	}
 	fmt.Fprintf(w, "[SUCCESS]")
 
@@ -36,6 +41,8 @@ func rpnNotify(w http.ResponseWriter, r *http.Request) {
 //receive RPN user name and card number
 func rpnNameAndCard(w http.ResponseWriter, r *http.Request) {
 	if r.Method != "POST" {
+		log.Println("ERROR collecting Name and Card Number,not HTTP POST")
+		logRequestDebug(httputil.DumpRequest(r, true))
 		errPage(w, http.StatusMethodNotAllowed, "invalid request")
 		return
 	}
@@ -48,13 +55,14 @@ func rpnNameAndCard(w http.ResponseWriter, r *http.Request) {
 
 	if !(id != "" && sign != "" && user_name != "" && user_card != "") {
 		errPage(w, http.StatusBadRequest, "missing parameters")
+		log.Printf("WARNING collecting Name and Card Number, require non-empty value, id=%s, sign=%s, user_name=%s, user_card=%s\n", id, sign, user_name, user_card)
 		return
 	}
 
 	row, err := getRequestRowByIdAndSign(id, sign)
 	if err != nil {
-		w.WriteHeader(http.StatusBadRequest)
-		fmt.Fprintf(w, "bad parameters")
+		errPage(w, http.StatusBadRequest, "bad parameters")
+		log.Printf("WARNING: collecting Name and Card Number, signature not correct %+f\n", r.Form)
 		return
 	}
 
diff --git a/rpnIn.go b/rpnIn.go
index 07e5286..97649a0 100644
--- a/rpnIn.go
+++ b/rpnIn.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"log"
 	"net/http"
+	"net/http/httputil"
 	"strconv"
 	"time"
 )
@@ -124,6 +125,7 @@ func (m *RpnIn) signature() (sig string) {
 
 func (m *RpnIn) md5key() string {
 	if m.Order_id == "" {
+		log.Println("WARN: rpnIn:md5key() trying to get MD5Key with empty orderID")
 		return ""
 	}
 
@@ -156,12 +158,14 @@ func GetRpnInFromHTTPRequest(r *http.Request) (ret RpnIn, err error) {
 	ro, err := getRpnOutByOrderId(ret.Order_id)
 	if err != nil || ro.Order_id != ret.Order_id {
 		log.Println("Cannot get RpnOut by order_id=" + ret.Order_id)
+		logRequestDebug(httputil.DumpRequest(r, true))
 		return
 	}
 
 	if ret.Signature != ret.signature() {
 		log.Println("Invalid RpnIn Signature")
 		err = errors.New("Invalid signauture for RpnIn")
+		logRequestDebug(httputil.DumpRequest(r, true))
 		return
 	}
 	return
diff --git a/rpnOut.go b/rpnOut.go
index 1335fb2..099a1c1 100644
--- a/rpnOut.go
+++ b/rpnOut.go
@@ -110,6 +110,7 @@ func (m *RpnOut) getMD5Key() string {
 	} else if m.Mid == Config.Rpn.MIDFAT {
 		return Config.Rpn.MD5FAT
 	} else {
+		log.Println("WARNING: rpnOut::getMD5Key()  has bad Mid = " + m.Mid + " cannot determin P2P or FAT, MID not match config")
 		return ""
 	}
 }