diff --git a/lib/log.py b/lib/log.py
index 40bdcfe..b9d0c50 100644
--- a/lib/log.py
+++ b/lib/log.py
@@ -55,7 +55,7 @@ def __init__(self, handler=None, level=logging.INFO, anon=True, name='audit'):
         self.logger.setLevel(logging.INFO)
         self.anon = anon
         
-    def audit(self, action, type, obj=None, anon=None, lthn=None, wallet=None, paymentid=None, sessionid=None, srcip=None, srcport=None, dstport=None, dstip=None, msg=None, method=None, uri=None, serviceid=None, cmd=None):
+    def audit(self, action, type, obj=None, anon=None, lthn=None, wallet=None, paymentid=None, cost_per_min=None, sessionid=None, srcip=None, srcport=None, dstport=None, dstip=None, msg=None, method=None, uri=None, serviceid=None, cmd=None):
         if (anon=="yes" or (anon is None and self.anon is True)):
             if paymentid:
                 paymentid = util.anonymise_paymentid(paymentid)
@@ -81,6 +81,8 @@ def audit(self, action, type, obj=None, anon=None, lthn=None, wallet=None, payme
             json['wallet'] = wallet
         if paymentid:
             json['paymentid'] = paymentid
+        if cost_per_min:
+            json['cost_per_min'] = cost_per_min
         if sessionid:
             json['sessionid'] = sessionid
         if srcip:
diff --git a/lib/service_hac.py b/lib/service_hac.py
index e24afc6..fc871b0 100644
--- a/lib/service_hac.py
+++ b/lib/service_hac.py
@@ -69,8 +69,13 @@ def connect(self, sdp):
         if (code<0):
             return code
         if (code==self.OK_NOPAYMENT):
-            log.L.warning("Now you need to pay to provider's wallet.")
-            log.A.audit(log.A.NPAYMENT, log.A.PWALLET, wallet=sdp["provider"]["wallet"], paymentid=self.cfg["paymentid"], anon="no")
+            cost=0.0
+            for serviceItem in sdp["services"]:
+                if serviceItem["id"] == self.cfg["paymentid"][:2]:
+                    cost=serviceItem["cost"]
+                    log.L.warning("Now you need to pay to provider's wallet. The cost of service is %s LTHN per minute. The minimum initial payment is %s minutes, for a total of %.8f LTHN." % (serviceItem["cost"], serviceItem["firstPrePaidMinutes"], float(serviceItem["cost"]) * float(serviceItem["firstPrePaidMinutes"])))
+                    break            
+            log.A.audit(log.A.NPAYMENT, log.A.PWALLET, wallet=sdp["provider"]["wallet"], paymentid=self.cfg["paymentid"], cost_per_min=cost, anon="no")
             code = self.waitForPayment(providerid)
             if (code<0):
                 return code
diff --git a/lib/service_ovpn.py b/lib/service_ovpn.py
index be92eb6..f93ea72 100644
--- a/lib/service_ovpn.py
+++ b/lib/service_ovpn.py
@@ -87,7 +87,13 @@ def mgmtEvent(self, msg):
         p = re.search("^>STATE:(\d*),RECONNECTING,auth-failure,,", msg)
         if (p and self.isClient()):
             if self.initphase==1:
-                log.A.audit(log.A.NPAYMENT, log.A.PWALLET, wallet=self.sdp["provider"]["wallet"], paymentid=self.cfg["paymentid"], anon="no")
+                cost=0.0
+                for serviceItem in self.sdp["services"]:
+                    if serviceItem["id"] == self.cfg["paymentid"][:2]:
+                        cost=serviceItem["cost"]
+                        log.L.warning("Now you need to pay to provider's wallet. The cost of service is %s LTHN per minute. The minimum initial payment is %s minutes, for a total of %.8f LTHN." % (serviceItem["cost"], serviceItem["firstPrePaidMinutes"], float(serviceItem["cost"]) * float(serviceItem["firstPrePaidMinutes"])))
+                        break
+                log.A.audit(log.A.NPAYMENT, log.A.PWALLET, wallet=self.sdp["provider"]["wallet"], paymentid=self.cfg["paymentid"], cost_per_min=cost, anon="no")
                 self.initphase += 1
             elif time.time()-self.starttime>float(config.Config.CAP.paymentTimeout):
                 log.L.error("Timeout waiting for payment!")