diff --git a/api/api.go b/api/api.go
index 68b936a22..b03d29643 100644
--- a/api/api.go
+++ b/api/api.go
@@ -103,6 +103,11 @@ type Identifier interface {
 	Identify() (string, error)
 }
 
+// Authorizer authorizes a charging session by supplying RFID credentials
+type Authorizer interface {
+	Authorize(key string) error
+}
+
 // Vehicle represents the EV and it's battery
 type Vehicle interface {
 	Battery
diff --git a/charger/openwb.go b/charger/openwb.go
index c8d2b4582..50a60ca28 100644
--- a/charger/openwb.go
+++ b/charger/openwb.go
@@ -21,6 +21,7 @@ type OpenWB struct {
 	currentPowerG func() (float64, error)
 	totalEnergyG  func() (float64, error)
 	currentsG     []func() (float64, error)
+	authS         func(string) error
 }
 
 // go:generate go run ../cmd/tools/decorate.go -f decorateOpenWB -b *OpenWB -r api.Charger -t "api.ChargePhases,Phases1p3p,func(int) (error)" -t "api.Battery,SoC,func() (float64, error)"
@@ -102,6 +103,9 @@ func NewOpenWB(log *util.Logger, mqttconf mqtt.Config, id int, topic string, p1p
 	maxcurrentS := provider.NewMqtt(log, client,
 		fmt.Sprintf("%s/set/lp%d/%s", topic, id, openwb.MaxCurrentTopic),
 		1, timeout).IntSetter("maxcurrent")
+	authS := provider.NewMqtt(log, client,
+		fmt.Sprintf("%s/set/chargepoint/%d/get/%s", topic, id, openwb.RfidTopic),
+		1, timeout).StringSetter("rfid")
 
 	// meter getters
 	currentPowerG := floatG(fmt.Sprintf("%s/lp/%d/%s", topic, id, openwb.ChargePowerTopic))
@@ -123,6 +127,7 @@ func NewOpenWB(log *util.Logger, mqttconf mqtt.Config, id int, topic string, p1p
 		currentPowerG: currentPowerG,
 		totalEnergyG:  totalEnergyG,
 		currentsG:     currentsG,
+		authS:         authS,
 	}
 
 	// optional capabilities
@@ -176,3 +181,10 @@ func (m *OpenWB) Currents() (float64, float64, float64, error) {
 
 	return currents[0], currents[1], currents[2], nil
 }
+
+var _ api.Authorizer = (*OpenWB)(nil)
+
+// Authorize implements the api.Authorizer interface
+func (m *OpenWB) Authorize(key string) error {
+	return m.authS(key)
+}
diff --git a/charger/openwb/topics.go b/charger/openwb/topics.go
index d3f6f023e..daa422b46 100644
--- a/charger/openwb/topics.go
+++ b/charger/openwb/topics.go
@@ -21,6 +21,7 @@ const (
 	EnabledTopic    = "ChargePointEnabled"
 	MaxCurrentTopic = "DirectChargeAmps"
 	PhasesTopic     = "U1p3p"
+	RfidTopic       = "rfid"
 
 	// charge power
 	ChargePowerTopic       = "W"
diff --git a/provider/config.go b/provider/config.go
index 1e92b0a10..319d141d1 100644
--- a/provider/config.go
+++ b/provider/config.go
@@ -22,6 +22,9 @@ type (
 	SetIntProvider interface {
 		IntSetter(param string) func(int64) error
 	}
+	SetStringProvider interface {
+		StringSetter(param string) func(string) error
+	}
 	SetBoolProvider interface {
 		BoolSetter(param string) func(bool) error
 	}
diff --git a/provider/mqtt.go b/provider/mqtt.go
index e35ebba06..607335151 100644
--- a/provider/mqtt.go
+++ b/provider/mqtt.go
@@ -203,19 +203,19 @@ func (m *Mqtt) BoolSetter(param string) func(bool) error {
 	}
 }
 
-// var _ SetStringProvider = (*Mqtt)(nil)
+var _ SetStringProvider = (*Mqtt)(nil)
 
-// // StringSetter invokes script with parameter replaced by string value
-// func (m *Mqtt) StringSetter(param string) func(string) error {
-// 	return func(v string) error {
-// 		payload, err := setFormattedValue(m.payload, param, v)
-// 		if err != nil {
-// 			return err
-// 		}
+// StringSetter invokes script with parameter replaced by string value
+func (m *Mqtt) StringSetter(param string) func(string) error {
+	return func(v string) error {
+		payload, err := setFormattedValue(m.payload, param, v)
+		if err != nil {
+			return err
+		}
 
-// 		return m.client.Publish(m.topic, false, payload)
-// 	}
-// }
+		return m.client.Publish(m.topic, false, payload)
+	}
+}
 
 type msgHandler struct {
 	mux     *util.Waiter