diff --git a/fsmEvse.py b/fsmEvse.py
index f7f2d7b..9ca7add 100644
--- a/fsmEvse.py
+++ b/fsmEvse.py
@@ -280,8 +280,14 @@ class fsmEvse():
                     self.Tcp.transmit(msg)
                 self.enterState(stateWaitForFlexibleRequest) # todo: not clear, what is specified in DIN
             if (strConverterResult.find("ContractAuthenticationReq")>0):
-                # todo: check the request content, and fill response parameters
-                msg = addV2GTPHeader(exiEncode("EDl")) # EDl for Encode, Din, ContractAuthenticationResponse
+                # Ask the hardwareInterface, whether the user already presented a valid RFID or similar
+                if (self.hardwareInterface.isUserAuthenticated()):
+                    strAuthFinished = "1"
+                    self.addToTrace("Contract is fine")
+                else:
+                    strAuthFinished = "0"
+                    self.addToTrace("Contract is not (yet) fine")
+                msg = addV2GTPHeader(exiEncode("EDl_" + strAuthFinished)) # EDl for Encode, Din, ContractAuthenticationResponse
                 if (testsuite_faultinjection_is_triggered(TC_EVSE_ResponseCode_SequenceError_for_ContractAuthenticationRes)):
                     # send a ContractAuthenticationResponse with Responsecode SequenceError
                     msg = addV2GTPHeader("809a021a3b7c417774813310c0A200")
@@ -291,7 +297,14 @@ class fsmEvse():
                 self.Tcp.transmit(msg)
                 self.enterState(stateWaitForFlexibleRequest) # todo: not clear, what is specified in DIN
             if (strConverterResult.find("AuthorizationReq")>0):
-                msg = addV2GTPHeader(exiEncode("E"+self.schemaSelection+"l")) # E1l for Encode, Iso1, AuthorizationResponse
+                # Ask the hardwareInterface, whether the user already presented a valid RFID or similar
+                if (self.hardwareInterface.isUserAuthenticated()):
+                    strAuthFinished = "1"
+                    self.addToTrace("User is Authorized")
+                else:
+                    strAuthFinished = "0"
+                    self.addToTrace("User is not (yet) authorized")
+                msg = addV2GTPHeader(exiEncode("E"+self.schemaSelection+"l_" + strAuthFinished)) # E1l for Encode, Iso1, AuthorizationResponse
                 self.addToTrace("responding " + prettyHexMessage(msg))
                 self.showDecodedTransmitMessage(msg)
                 self.publishStatus("Authorization")
diff --git a/hardwareInterface.py b/hardwareInterface.py
index 793bd5e..f25fa5d 100644
--- a/hardwareInterface.py
+++ b/hardwareInterface.py
@@ -215,6 +215,18 @@ class hardwareInterface():
         self.callbackShowStatus(format(self.simulatedSoc,".1f"), "soc")
         return self.simulatedSoc
 
+    def isUserAuthenticated(self):
+        # If the user needs to authorize, fill this function in a way that it returns False as long as
+        # we shall wait for the users authorization, and returns True if the authentication was successfull.
+        # Discussing here: https://github.com/uhi22/pyPLC/issues/28#issuecomment-2230656379
+        # For testing purposes, we just use a counter to decide that we return
+        # once "ongoing" and then "finished".
+        if (self.demoAuthenticationCounter<1):
+            self.demoAuthenticationCounter += 1
+            return False
+        else:
+            return True
+
     def initPorts(self):
         if (getConfigValue("charge_parameter_backend") == "chademo"):
             filters = [
@@ -236,6 +248,7 @@ class hardwareInterface():
         self.loopcounter = 0
         self.outvalue = 0
         self.simulatedSoc = 20.0 # percent
+        self.demoAuthenticationCounter = 0
 
         self.inletVoltage = 0.0 # volts
         self.accuVoltage = 0.0
@@ -270,6 +283,7 @@ class hardwareInterface():
     def resetSimulation(self):
         self.simulatedInletVoltage = 0.0 # volts
         self.simulatedSoc = 20.0 # percent
+        self.demoAuthenticationCounter = 0
         
     def simulatePreCharge(self):
         if (self.simulatedInletVoltage<230):